I bought the 4AUPC board with 4 305oz/in motors and the HCNCPRO board. Both took roughly 6-7 hours of soldering to complete.
I was taking my time. Someone posted they had theirs done in 90 minutes. Hmm I dunno.
If you aren't comfortable with soldering, then this may not be for you. If you feel at home with a soldering iron, then go for it.
Dave provides top notch support. You can also get support from others in his Yahoo group once you have made your purchase.
The only thing I can say is that I was too conservative at soldering my first board. You have to make certain the solder flows to BOTH sides. My second board went together easier. I reversed a few capacitors, but fixed them before applying power.
Always double/triple check the directions before applying heat. It is so much easier to flip a component that isn't soldered in place.