I am new to the sport and decided to upgrade to a tri bike after using a road bike for my first duathlons and triathlons. After reading a lot of opinions on ST, BT, and various magazines, I narrowed the field down to the Felt B2, the Cervelo P2C, and a Cannondale Slice 3. The Slice wasn't exactly raved about much in the sources I tapped, but the LBS had a 2008 they were willing to deal on. I rode all three yesterday back to back so I would notice the differences from one bike to the next.
Cervelo P2C - Tough to beat, no question. Outstanding value, rode like a dream. One little factor tipped me toward the B2 and that was some concern I had about the FSA Gossamer crankset the Ultegra model came with. Cervelo gives you a better crankset on the DA model for $3,000, so I figured that would be the model I chose if I went with the P2C. One other very minor factor, I wasn't crazy about the red color you are stuck with on the DA equipped P2C.
Felt B2 - This bike was on sale at a LBS for 20% off since it was a 2008 model. This put the price squarely between the Ultegra P2C and the DA P2C. It came with the FSA SL-K crankset that has had 'issues' in the past that allegedgly have been addressed. The bayonet type fork is nice and the bike handled as well as the P2C, maybe a bit better. In general, since the B2 started at a retail price point of $3,600, it came with a bit nicer components including DA front and rear derailleurs, shallow aero wheels, nicer base bar and aero bars, etc.
Cannondale Slice 3 - Very lightweight and I think it would have been a great handling bike, but the base bar and aero bars on the bike I rode just didn't agree with me at all. I felt so unstable going down a hill at about 22-23 mph that I wasn't willing to get into the cups. I couldn't hold a nice straight line when getting in and out of the aero position. In general, I just couldnt get comfortable and I felt like the whole front end would have needed to be changed out for me to feel confident. However, it was the lightest of the three and probably had the highest quality frameset. With my wheels, this bike would have tipped the scales at around 16 lbs!
Longer than I intended, but this tri bike thing has been a major project for me. I decided on the B2 and can't wait to pick it up on Saturday after the bike shop gets the aero bars I want installed (same bars as the P2c). I have suffered with back pains on my road bike that persist even after careful adjustments by the LBS. This really hindered my running performance. I have been working on strengthening my back and standing up on the bike more to get rid of the problem. Hopefully I will see some improvement in upcoming months.
Greg