I have no experience with WAC. I know others have and you should try and get some feedback by searching. Try to get more recent feedback if possible.

I bought all my reps from ebay. I doubt there are many mfgrs of reps for the 177s. They are all probably similar quality.

Vibrations can be caused by many variables, like condition of tires, wheels, suspension, alignment, rotors, etc. I can't speak for others but I've never had a vibration I could not resolve - and the solution was never to replace a wheel because of poor quality.

Most of the time its proper tire/wheel balancing and/or requiring hub-rings.

That's my personal experience and all with replica wheels. YMMV.