I've got an Tivo S3 and the program guide implementation is a lot better than the Motorola/Brighthouse box. Picture and sound is also better as the S3 is THX certified.
I would caution you though because Brighthouse's pricing structure cost you about the same with or without their cable box.
I eventually got off cable due to picture quality issues. Too much variation among channels and everytime it rained, it took a few days for signal problems to clear up. Then when there were the seasonal swings in temperature, they'd have to come out and work on redoing the signal strength. Just too much grief when I could swith to satellite and just watch TV. I still have the Tivo and use it for OTA.
A major game changer is that Dish is coming out with a DVR that called the Hopper that will record all 4 national networks that use a single transponder in one signal stream. Translation, it uses one tuner for all 4 channels and you can use the remaining tuners for other channels.
By the way...anyone interested in buying an SVS PB Ultra-13 in textured black, PM me.