I have three suits, a dozen shirts, and tons of ties from WW Chan that I purchased over the past seven years. Peter Chan is a perfectionist, and one heck of a nice guy. But WW Chan is not where you will buy your custom-tailored suit for $300. The last suit I purchased was over $1,000, and that was pretty much the going rate for nice fabric (Zegna). Four years have passed since then, and I expect prices have risen with changes in the exchange rate - perhaps has high as $1500 today. Of course, you are getting a suit that would cost twice that amount - or more - in Europe.

If you go with WW Chan, give them time to do quality work. This is not a 'fit one day, suit the next' kind of place.

There's a thread over on styleforum.net about Shanghai bespoke tailors; lots of discussion comparing WW Chan to Daves - most people favoring WW Chan.