Earlier this year I decided to design and build a breakout board for the Neo format u-blox modules. I had looked at many of the offerings from e-bay and other sources. I have many of these boards, and some are better than others, some use "fake/clone" modules, some are downright junk.
I had no help from u-blox, and I have no association with them except as a customer/user. I am a retired EE a ham and have a passing knowledge of RF pcb layout. It took me about a week to do the actual layout (many many revs). I had the boards built in China, (cost about $US2.00/board) and bought all the parts from DigiKey, including the modules. I assembled the boards myself. It took me about an hour to build 3-4 boards. I test their power supply before soldering on the u-blox module.
I have built and tested boards with the Neo-7N, Neo-M8N, Neo-M8T, Neo-M8U. The boards support the Neo-M8P as well.
The attached pictures show some of the boards and the antenna, the layout, a screenshot of u-Center. You might notice that the signal levels are a bit low. That's because the antenna is a GPS only antenna located inside about 5 feet below a metal roof that shields 1/2 the sky. Most of the signals are from multipath. With a good antenna (Tallysman 3710), outside, the signal levels are very, very strong.
To say that I am pleased with the performance of the Neo series parts is an understatement. They are easy to work with, the boards worked the first time, and yes, there is one red wire that was a feature that I decided to add after I sent the boards off for fab.