I've got the BA Fly Creek UL1, and have used it for a couple of seasons now. Its got just enough room for me inside, (I'm 5'11", 160), but the vestibule is only big enough for a pair of shoes and a water bottle. What I like most about it is the tiny footprint; I can pitch it almost anywhere, and there's not a spider web of guy lines like some tarps have. What I like least about it is the entrance. My creaky old back does not like getting in and out of the thing. That's why I'm looking at something like the TT Notch to replace it. All in all, though, it has been a steadfast companion.'
Not trying to sound like a smart aleck or anything, but if you own both tents, and want to get rid of one, why don't you just sell the one you like the least?