Sorry, it's been a while! Since last summer, I replaced the two CAA66 with two CAM6.6 units. Four rooms have the 5.25" Monoprice in-ceiling speakers, four have the 5.25" Monoprice two-way in-wall speakers, and two have the 5.25" Monoprice three-way in-wall speakers. (the remaining two zones are both outdoors, one with Polk Atrium 4's, and one with TIC GS3's)
The CAA66 setup was satisfactory; I had four inputs connected: two AirPort Express stations for AirPlay, one cable STB for listening to games outside, and one DVD player for playing the occasional CD. However, I found good deals (eBay) on two CAM6.6's, an ST2 (dual AM/FM), and an SMS3... and what a difference. Really enjoy the keypads (three TS2, nine S2) and their command of the ST2/SMS3.
As far as the speakers are concerned... I'm very happy with the Monoprice products. The CAM provides 20W/channel, which I was initially skeptical about, but have found the power sufficient for my needs (with the exception of the zone with TIC GS3's - 20W/channel was decent, but I'm much happier with a separate amp for this zone at 2x75W - also, due to the length of cable I ran [~120'], I heard a huge difference when I swapped out my initial 14/2 runs for 12/2). The two-way vs. three-way? Some people can tell the difference, but most cannot. Actually, I think the three-way (though a nicer sound) distort more quickly than the two-way speakers at higher volumes - though at 20W per channel, distortion is rare.
I've been through several different products in the last few years - Russound A-BUS, CAS44, CAA66, CAM6.6; Sonos; SpeakerCraft MZC-66. If anyone has questions about my setup or my experience, I'm happy to share my experiences!