I personally would stay away from the t451. It just does not work well. I had one for about a month and had consistent issues with it in singal reception. I swapped it out with an LG model and have never experienced problems since.
I thought the guide was nice however when I was able to get the info.
Also, since the t451 has a QAM tuner, I thought it would do QAM on my cable system. Sure, it works,but only with QAM64, won't do QAM256 (at least the revision I had). My LG handles it all no problem.
I have no experience with the 360 model.