Pleasantly surprised by these speakers. Replaced some MTX and Soundstream 6x9's with these last night and these sound significantly better. Very clear at all volumes and they handle the lows much better than the other 3 sets that have been in the car (stock, MTX Thunderdome, and Soundstream SST).
I would highly recommend.
As a side note: they are the same as the 609s, they just don't come with a grill.