My BRU has a CA!! I just checked it out, and think I can answer my own question. It looks like the CA has a base more like the Avenue than the Uptown. The cover goes over the 'lip' like the Uptown, but it has the cutouts like the Avenue - not exactly the same, but similar.
I got the impression that the CA may be a fickle seat to install ff because of the lip thing. I'm planning on buying one, but will only keep it if I can get a solid install both rf & ff in my van, with and without latch.
Other impressions, I liked the cover (Harvest), the fabric material and the padding. I loved the head wings/pillows. I didn't like the buckle & tounges that much, but they weren't bad. I really didn't like the harness clip, though. As I said, the base design looks a little fickle. I'll need to see if my van & the CA like eachother.
Overall, it seems like a solid seat, although I think it is worth about $200 or so (which is what I hope to get it at with a BRU coupon).