I've been tempted by these as well, and so far have picked up four of them (Mail in Rex, Obi-Wan, Anakin, and R2). I think I'll likely get the rest eventually, but it depends on the funds at the time. If I am into this line though, I'm definitely going to just do a "one of each" thing, no army building or any of that jazz.
Like Jesse and others have mentioned, I think this line might do pretty well. I saw kids pretty psyched about it over the weekend as well (at Midnight Madness even, surprising to see so many kids out). I went back to our local WM and TRU yesterday, and I couldn't believe how depleted they were. TRU in particular had nothing as far as Hasbro stuff really. No vehicles (new packaged ones anyways), two basic figures (two Clone Wars R2s), no Evolutions, Battle Packs, etc. They had a few of the repackaged Galactic Heroes as well, but that was about it. WM was sold through pretty well too, for only a couple of days on the shelves. The "regular" SW section was completely wiped out, and there were a few basic figures left in the aisle display (with the Falcons/lightsabers). They had two AT-TEs (and several Falcons), but the $20 vehicles were pretty much wiped out if they were new (they had the repackaged ones). With the movie still weeks away, I'd say the line is doing well so far (Legacy and Clone Wars).