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Visit U&I (quickturnpcb).
There are 7 reviews with an average rating of 4.4. 
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I have been using U&I for over 10 years for both prototyping and production and I have never had a bad experience with their PCBs. The quality of their PCBs is top notch and their support is equally excellent. I also found that they can exceed their published specs if you talk to them in advance. As for shipping... their process is the best I have come across in that I typically receive my PCBs (to Canada via DHL or Fed Ex) within 1-2 days after they send me my tracking details. Other PCB firms are not nearly as efficient when it comes to shipping, as I find this other firm's ship time to be 7-10 days using the same carrier. The only slight is that they do not offer stencils, as if they did then it would make them a one stop shop.
I needed PCBs with some unusual specs and a rush turnaround time, and this shop did a great job with it. The PCBs looked great, and arrived on time. I like that they come standard with flying lead testing. I agree with the other review that says the website is a mess, it really is; but I was able to place an order ok, and like I said the results were great.
I have ordered PCB production multiple times to U&I, and everytime they provided thorough check on the specification and files I uploaded. The email correspondences with them were swift enough to make shipping on time even with a few issues. The website that has been updated recently is visually clear and contains full information about their design rules and other technical agendas. Although it has not responded correctly on occasion, I could always get what I wanted eventually.
The website for this service is nearly impossible to use. It resets and has interrupting prompts constantly, does not calculate any panel information for you, and cannot process orders for multiple designs at the same time. It also failed to register us after three tries and still says our user ID does not exist. We'll be using something else.
We've been using U&I as our main supplier for prototyping and low-volume production for about 3-4 years. We like their no-fuss ordering process, excellent prices, and consistent on-time shipment. Board quality is good too.
I am very impressed with the quality of the boards that I received. I've been heavily using US quick-turn suppliers for most of my work, but I needed to run 300 pcs with 5/5 features, so I decided to shop it around. Given Korea's general reputation for being quality-minded, I decided to go to U&I instead of the lowest-quoted suppliers in China.
The ENIG and soldermask looked great -- but what really made me happy is the overlays -- very fine-features tiny text is very legible, instead of the bumpy/ragged mess that comes from screened overlays.
I'll be sending more to them for sure!
UPDATE 01/02/2017: Continued to be impressed
I've reordered a few more times from U&I and have been continued to be impressed by the quality of the boards that they make.
I did have a small problem with them due to the way their website works -- I accidentally submitted the wrong set of design files, but there was no obvious way to catch that error until I received the boards.
Even though it was ultimately my mistake, U&I provided a generous discount to produce and ship the correct design.
To avoid the same mistake that I made, make sure to write an order note indicating the correct submission zip filename; or request a check-plot.
I have been using U&I for my prototype and production PCBs for about 4 years (about 40 different designs) and I have to say that they are one of the best PCB manufacturers around. Their prototype PCBs are excellently priced and the quality is simply outstanding... hole registration is bang on and they use a super tight high quality solder mask which is the best I have seen. I have never had a bad board. They are my board house!