I think I'm one of the few that didn't really get sucked into the Alt/BT craze.
I haven't had the urge to pick up more since a lot of them don't look very good in robot mode imo, which I display most of my collection in.
I decided to pick up both Jazz and Shockblast from a board member some time ago, but turns out Jazz's hood was yellowing so I sold it off. Then I decided to pick up Smokescreen after looking through seibertron's galleries to see which ones I liked. A few months ago I decided to seek out Prowl and Hound as well, but was sort of disappointed in them (both look great in alt mode but not so good in robot mode).
I'm not extremely interested in the line, but one day I would like to pick up a Ravage 2.0 and 'try' at least one BT (probably Jazz to replace the Jazz I sold).