tobe, I'm just doing it in the meantime until MTS Ultimate TV is available in my area. My wife's been itching for a PVR, and they "gave" us one free (I think we have to give it back when if we cancel). MTS has been good to me, too, and they just put me back on a winback promo about a month or two ago like 2 days before my shaw appointment. We decided to stay at first, but my wife just couldn't wait any longer. Plus I get to finally experience HD on my new TV (only had it about a month or two).
I still like the Ultimate TV service better (I get to use it every day when I'm installing it) but I don't think it'll be in my area anytime soon
I don't see what's wrong with switching back and forth. I think it makes for good competition. I think both providers will not tolerate people who abuse it, but I think it's fair if someone goes with one for a year, switches to another for a year, etc. I don't think they like it if it's less time than that.