In my old age of 36 I've noticed that I get cold feet more easily than I used to. And with the last two winters being absolutely relentless, it's been a chore keeping my toes warm. I have custom footbeds in my boots and use boot gloves, and go through the usual precautions - put on ski socks and the boots in the chalet, keep them warm and dry, etc. None of that could keep my toes warm in the -25C I was skiing in last week. So I started looking into battery powered boot warmers. Today I stopped by a local ski shop, which sell Sidas boot warmers. I'd never heard of Sidas before, most of the forumers here mention Hotronics or, less often, Thermic. Sidas seems to be a bit of a mystery. The store clerk said that Sidas bought out Thermic and now uses Thermic as their big box line while the Sidas warmers are the more professional line. He kind of rolled his eyes when I mentioned Hotronics and said that they're not as reliable. I took all that with a grain of salt of course, he obviously wants to promote what he sells. They sell for $299 in Canada.
So I'm putting it to the fine folks here, does anyone have experience with Sidas boot warmers? How do they compare with Hotronics? They're a French company that seems mostly known for their insoles and footbeds. No mention of their boot warmers at all on Epicski. I attached a picture of the box. For the record, I use Lange Banshee Pro boots.