Yes....I have the CBM-170's and love'em.
That said, my room is 13 x 18 w/ 8' ceiling with two openings to a hall and kitchen. They will play as loud as I need them to with the 1050, which is rated at "only" 65W, 3 channels driven!
A lot of folks who start out with the 170's move to the 340's and relegate the 170's to surround duty. The 340 is said to play "bigger", which makes sense due to the fact that it's larger and uses two of the same woofers as the 170. I have never heard them, so I am reporting what I have read on the Ascend forum(which is currently down, but should be back up soon). I have never felt the 170's were lacking. I replaced a pair of B&W 602's w/them and never looked back!
BTW, I used to have a NAD Preamp/Rotel Amp setup before deciding to go multi-channel Dolby Digital/DTS. I went from that to a Marantz receiver, and from the Marantz to Outlaw 1050. The Outlaw brought the musical quality of those seperates back into my system. The 1070 will most likely improve that quality while offering the latest decoding and switching features.
Depending on your location, you could probably setup an audition with an owner of Ascend speakers.
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It's all about the hardware!