Not being a bass player, I really can't offer any opinion other than if something seems too good to be true, it usually isn't true. The web site sounds a little like Why pay hundreds of thousands for a Ferrari. We cut out the middle man and only charge you for a little metal, leather, plastic, and an honest day's work, so you get your wishcar for $1500!
That being said, the reviews over at harmony-central are actually surprisingly good! Here's the link:
http://www.harmony-central.com/Bass/Data4/Wishbass/ By the way, I had a wishguitar for 30 years (as in: I wished my guitar was an Alembic).
Bill, tgo