I've been using my CX700 setup as my primary for the past ~6 Months. The frame may not be the lightest, but I think its great, especially considering I managed to get a frame+fork for $280 shipped. The weight is true to the O8 website's claims.

The quality control is pretty high on the frames, and the paint is pretty darned nice. But these are symatics; the ride quality is good, and it fits 29x2.1 tires quite easily. For my riding this winter, I've been having great fun with these wide tires - snow isn't a problem, and at low PSI, the bike even handles ice realtively well. If you *do* plan on winter commutes, this might be useful...

It has a nicely designed HT and fork, so it also does well in the summer with slicks. I ran 700x23, and noticed only a bit of road noise. I've got mine built up montercross style, with 42cm drop bars, cross brake levers and 3x8 STI's. Using a casette with an 11 tooth top, I have no quibbles with running my 22-32-42t MTB crank - this gives me a top gear of ~94in. But i'm slow, generally use wide tires, and there a lot of hills around me so I'd never even consider a road crank; a not issue for me with this frame.

The double-eylet up front on the fork is often missed by people. For a tourer/commuter like me, this allows me to use both a low-rider rack for panniers AND a top rack for small stuff sacks. Truly helpful. The rear rack is mounted a bit high, on the seat stays, but so far, no problem with heavy loads and stability. The high-up fender mounts make it near impossible to use the standard fenders on the rear, however. I cannot use the bolt-on type that usually mounts to the dropout area. I DIY'ed it with a few screws. This, again, wasn't make or break, but might be a fuss for commuters.

Those are a few of my thoughts. Hope they helped you to decide.