I had General Altimax Arctics on my van, and I quite liked them. Non-studded, and there was some slippage on ice towards the last half of their lives. My wife didn't like them at all, though. Too much slippage for her. I think it boils down to the lack of driver control over an automatic versus a manual, the latter being my wife's preference. I let up on the accelerator of the van when I begin to feel slippage, and she doesn't seem to as much. She told me the tires she thought were way better were the Canadian Tire branded Motomaster Nordic IceTrac, which were made by Michelin, and were a copy of their European Kleber KrisAlp. She also liked the Bridgestone Blizzak WS-50 on our car, which by that point was no longer in our fleet.
The General's were done in early last winter, after irreparable damage happened to one. They were all near the 5/32" point I would replace winter tires, and that would have been their last winter anyway, and seeing I couldn't find a used Altimax Arctic to match, we sprung for replacements. We also got a new car this January, and it ended up with the same tire we got for the van.
My in-laws had the Michelin X-Ice Xi2 on their van, and I drove it a couple of times and had to admit they felt better on ice. This lead us to the Xi3, which replaced the Xi2.
While I wouldn't call them horrible, I am not overly impressed with their winter performance, especially this season with the ice and snow having just hit us. Perhaps I should lower the PSI slightly (I tend to run 2 PSI over placard), but that small a PSI change has never had an impact on any previous winter tire I owned.
The van, running 215/65R16 102T, is slightly better, but I still find the tires losing ice traction sooner than I think they should, nothing that can't be very quickly corrected by a throttle adjustment, but still happening when my experience says it shouldn't. Worse is the car, equipped with a manual I might add, and running 215/60R16 99H. Maybe it is an overly aggressive traction control system (the van does not have TC). Maybe the H compound is harder than the T compound. I don't know, but I am underwhelmed. I could have bought a "lesser" tire, enjoyed the same performance, and pocketed the savings. My wife on the other hand seems quite happy with them. We switch off both vehicles regularly, so it's not a vehicle difference that is causing our differences in perception.
While it will be years down the road, I think the next sets of winter tires I get will be studded.