I did, a buddy of mine had an upgrade and he wanted a DX, but at the time they were still on back order, so I told him if he got a Fascinate that I would trade him straight up. So far I'm really liking it, the screen is absolutely amazing, I can not get over how great it looks compared to the DX and it is very quick, none of that lag(lock screen) that you had to deal with. Most importantly, soon enough we will have custom ROMs, true custom ROMs with kernels, which was my main reason for making the switch.
The drawbacks, for some(from the DX) are camera is not as good, not as much internal storage, smaller screen(I almost like the 4" better) and build quality does not feel quite as solid.
All in all, I would recommend the Fascinate, it is a great device, one of the best that I've used and I've had every Android phone on VZW's lineup. It does have its bugs, but nothing that really effects the usability. Also, knowing all the help and general knowledge that you provided to the DX users, you would be a great addition to the us Fascinate users, we would be lucky to have you!