I have a TIVO Premiere installed on a TWC system in Milwaukee. I had a lot of trouble initially with the installation, and documented it in the threads linked below. Once I finally got it working, it has been relatively trouble free. However, the tuning adapter still gets confused every few weeks and needs to be rebooted. I was initially rebooting the TIVO as well (a 30 minute process), but that seems to have settled down. Once I got it working, it has served me well, and I am happy.
The real problem is that the TWC techhs who come out to install the necessary cablecard are not trained to do so, and most of the online tech support has never heard of a TIVO.
http://www.satelliteguys.us/time-warner-cable-forum/235500-twc-vs-tivo-adventure-frustration.html
http://www.satelliteguys.us/time-warner-cable-forum/235502-tivo-twc-review-what-expect.html