I have two that I purchased from LeBaron's, about ten bucks cheaper than Canadian Tire IIRC, but they appear to be the same Tasco model. One lived on a .22 for less than a year before giving up the ghost. The other is still going strong on a 12-gauge after about 600 rounds. Go figure.
The one that still works has always had a very stiff on/off/power adjust dial, and the dot isn't as sharply defined as on some better ones that I've seen. The mounting system is total crap, although as I said it seems to withstand the shotgun recoil so far. Windage and elevation adjustments seem to work as they should.
I personally wouldn't buy another one.
John