I had this ram ALMOST running cas2.5. I picked it up on the same deal at Microcenter earlier this year.
I tried running it at 400mhz cas 2.5. It would pass memtest but I got random lockups, about once a week. Especially Civ4.
I clocked down to cas 3 and the problems went away. So don't expect to push this ram too far. I think I got about 10-15 extra mhz out of it tops at cas3 (no extra volts though).
Very cheap though for a gig. Ram prices just aren't dropping.
If you're creative or overvolt it a bit you may get cas 2.5 out of it. Maybe. FYI. I chucked it in my wife's box when my cas 2.5 Corsair value select came back from RMA.