im replacing my tivo hd with a premiere for $49. with a 30 day return policy, why not? i only care about dvr functionality. 1) i've heard there were lag issues when the premiere just came out there were lag issues. is this still an issue? 2) HD upgrades. is this possible like with the tivo hd? 3) any issues with twc/tuning adapter compatibility? the tivo hd has garbage collection/guide issues that have been plaguing me.