I have 8 HT Polar Therm tipups...never had a problem with them, so I've never changed to another brand! Beaver Dams are nostalgic and all, but at the end of the day it's an ancient design and they are $50/ea. and your hole is still not covered...but don't worry! For an additional $7-8/ea. you can purchase Beaver Dam foam hole covers to cover the hole! Now you are at nearly $60 each and for that I can nearly buy THREE Polar Therm tipups that stack nicely in a round bag or 5 gallon bucket! I also despise the fact that Beaver Dam has never put a handle on the bottom of the spool for reeling up line...
Now, Frabill makes a thermal tipup that in my experience is an absolute JOKE...sure, they cover your hole and are insulated, but the flag stick is about 8" long and in deep snow or when the tipup is more than 30 yards away, they can be hard (or impossible) to see! The Polar Therm tipups I use have a telescoping flag stick that is over 3 feet tall...no problem seeing them from 100+ yards or in deep snow!