I got my titanium Mosaic RT-1 after seeing one and thinking it was beautiful. Seriously, that is an underrated reason. I still get admiration all the time on the road, and it's 7 years old. (See below.)

I have a 2011 Cervelo R3, which I loved, but the Mosaic is more comfortable. However, this may be primarily because I can fit 25s on the Mosaic, but only 23s on the Cervelo.