Interesting you're so critical of the X Ice... My aunt/uncle who live in Burlington swear by them due to Consumer reports, etc... and their biggest argument for them is that he can use them for 6 years .
I guess for GTA mild winters it may be good enough though.
The Blizzaks are generally what, $200 cheaper a set? So if they last one year less, they don't actually work out a whole lot more expensive. I find the traction amazing, so that's likely what we'll go with for the Odyssey.
I think age is relative...My Forester is on Blizzak WS70s going on 4 years. They, have 10/32" left despite similar mileage to the Corolla. What's worse, Lady Noto's schedule meant that the WS70s didn't come off until mid-May some years, and always go on after Halloween (the Corolla's changeovers are much less conservative, usually mid-December until mid-March).
While I can use the Xi2s until 4/32" instead of 6/32" on the Blizzaks, I would opine that the 4/32" Xi2s aren't as useful as Michelin would have you believe. Potentially still better on sheer ice, but absolute sh!t in any amount of snow.
...and I live and work in the GTA and can tell you that they are not 'sufficient' for 'mild' GTA winters. Since when is being consistently below -10'C (closer to -20 these past 2 winters) 'mild' any way?
I don't think the Blizzaks are cheaper at all compared to Michelin's offerings, but IMO, I'd rather have a better tire that I have to replace more often than one that I can eke another season or two of sh!t traction out of.
Again, I have not tried the Xi3s, and I'm sure they're better, but I am so thoroughly unimpressed with the Xi2s that I don't want to take another 5+ season 'risk' (or sell at a loss after being unimpressed for a season).
Working in personal injury makes you really not care so much about saving a few bucks at the expense of traction...sorry if my opinion is biased in that respect (note the sarcasm, I'm not actually sorry).