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Visit Advanced Circuits (4PCB).
There are 15 reviews with an average rating of 2.1. 
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Couldn't provide functioning boards, won't return our deposit or respond to our inquiries. Would give them zero stars if I could.
These people only respond to you if you're sending them payment and CC info. I had an issue with a controlled impedance board that I paid $3500 for, and they do not reply to any emails about the board. When I gave them a call they said they would look into it and I never heard back. Avoid at all costs!
I approached forrest at Advanced circuits to make up a prototype of a PCB design we have. They quoted the build and freight. Then when we placed the order and paid the funds in full, they advised that for some reason they could not get the parts, so then I free issued half of the components (with no refund to myself). They then sent the built PCB to us, to discover they had forgotten or missed half of the components on the BOM and order including the parts we free issued.
They then had the audacity to send me a letter of demand chasing more money for additional freight. Which was never communicated to me before freighting the PCB to us.
They claim to operate an ISO9001 quality company yet i fail to see how they have the appropriate checks and balances in place if these sorts of scenarios arise. They then had the audacity to give a $30 credit for missing parts and assembly they charged me $390 for. So now I have a PCB that I spent $2800 that is useless and now i have to source elsewhere from somewhere more competent. I tried so hard not to source form china, yet i failed myself in choosing these operators.
When I received my PCBs I gave them a quick visual inspection and saw that about a third of the pads had solder bridges and areas of the circuit board had not been printed through. They were completely unusable. I reached out to 4PCB and they said they would look into it. That is the last I heard from them. After repeated emails and phone calls, no one got back to me. All I can say is I should have read this review site first. They will never rip my off again.
This place is a joke. Requested a 1-2 day turn on a 4 layer board on a friday. It took until the following wed to get it started. Was just informed stencil is not arriving with the boards which we paid a lot for to get a 1 day turn. I will never use this company again.
Basically we paid a 11 day job to be actually done in 21 day. I have to say that out of this 10 extra days one was our fault because there was a mistake on the file wich we fix and send back in that same day, the rest 9 days lost it's totally their fault and lack of resposibility. When I sent a message to complain they said we paid for 21 days job so basically they lied to me in my face when I have the quotation, the emails and the payments on my hand and when I complain about this they just say "we will see what happened" and never reply. Until today we just feel we got cheated here.
I used their 4-layer special 5-day turn. They were actually done in 3 days. They did high-quality work and when I stuffed the boards, the circuit worked beautifully. They have a 90 day warranty.
Been using them for quite a few years however their quality has dropped and we will no longer buy from them! We have simple 2-layer boards with ground planes on both sides and 10 mil spacing and they consistently have solder shorts on the board 6-8 pcs/100 boards unacceptable to say the least.
Pros:
FreeDFM.com works, sometimes
Cons:
Additional fees/charges assesed to a quote after ordering.
Promotions not honored in all cases, especially for student orders.
Sales representative was condescending and interrupted me while I was explaining my situation.
Overall, not pleasant people to do business with. Only continuing my order since our lab instructor requires us to only use them.
Read this out loud:
E X P E N S I V E -- over $300 for a single 2 layer board quote with $50 credit applied.
Would highly recommend finding an alternative supplier (Ex JLCPCB)
Every board I've done with 4pcb has worked perfectly well. The staff are super friendly and helpful. I did a board six months ago, I needed to send the gerber files to a client, I wanted to be 100% sure they were exactly the same ones I sent to 4pcb for fab, sent an email to 4pcb, and they responded with the gerbers in less than 24 hours.
The only drawback is the prices are kind of high and the options limited (without paying considerably more). I would note that some low cost manufacturers promise superior specs for lower prices, but my colleagues have had mixed results with these when pushing these to the limit (internal shorts developing in board, typically appearing after a few days of work, in an extreme case all 5 copies of same board shorted between same nets, which remained even after removing all components from board). 4PCB delivers what is promised for the agreed price, and the service is at least what you'd expect for what you're paying. Whenever I really want to make sure my board will work immediately, I order from 4PCB.
I do agree with other commenters they should modernize their website and expand the specification options of their specials (maybe add a few solder mask color options) to stay competitive. The product is good, the service is excellent, but marketing could be improved.