I ordered my whatnot through the FAO site over the Thanksgiving weekend. I had heard about the whatnots back in 2008 and meant to see the workshop in person next time I made it to NYC.
Never happened, so when I saw it on sale for 84.99 that weekend, I jumped on it. I also had run by the local toys r us to see the kit in person. It appears the kit from TRU is a bit smaller from what I can tell. Also, I talked to employee there who had seen the ones in NYC and he said the same thing. I am very happy with my whatnot. Though getting my hand passed it neck was a little challenging with my pudgy right hand. This was a gift to myself this, to entertain the kids.
I am still tempted to get the TRU kit, for the kids to play with.
Also, right now the FAO site is saying the whatnots are temp out of stock if you build one and add to cart.
Good luck.
PS I'll post a vid of my guy.