I used CL for a week or so. I was on their 40/5 package and the bandwidth was great (consistently 38-39 Mb down and 4-4.5 up and I happen to be ~2 blocks away from the DSLAM). However, latency was the issue for me. I'm a gamer and some servers I connected to were in the mid to high 100s (average) for latency. Whereas with cox I would get high 40s low 50s to the same servers. That's what brought me back "home" lol.
I think the high latency is avoidable if you tone down the interleaving (dsl technique to deliver reliably at layer 2 without jitter) the question is whether you can avoid packet loss when doing so. Just something you have to deal with when transferring high speed data over voice grade lines.