I have a 2006 Eclipse that I bought as a frameset on eBay about 6 weeks ago. Built it up with an Ultegra/105 setup, but the frame and fork are stock.
Simply put: I love the bike!
It has the best ride qualities of steel with the benefit of carbon to dampen the resonant shimmy that can happen with 853 frames (my previous bike was a LeMond made of 853 and 531). It's not as light as a full carbon frame, but is a bit lighter than a full steel setup.
As far as ride quality is concerned, it's really great for long-distance rides. It's a decent bike for climbing and an extremely confident descender. The wheelbase is long (like LeMond's), so it tracks straight and true at speed, and corners well. I wouldn't consider it for crits, but for road races it would be fine.
The stock Easton EC70 fork is nice, though if you are a clyde it's a bit flexy under extreme load (that said, it's very damp if you're under 200 lbs.). Mine came with a Truvativ Roleur Carbon compact crank, which is very nice, if not the lightest unit on the market.
Fully built up, my 61 cm Eclipse weighs around 18.9 lbs - not the lightest rig in the peloton, but fine for me.
And grab the Eclipse while you can: it's been discontinued for 2008.
