Well my WA3+ has been heavily modded and now is almost like a different amp. I would say mine is near the performance of the WA2 if not the same performance.
Even when the WA3 is not modded it still sounds incredible. Well worth the price ;)
Also Woo Audio is not a store from what I understand. Everything has to be purchased in advance and they build it then ship it out. So no walk in at all.