I own 3 of them and they're my favorite tipups. My only real complaint with them is transporting them, they have an awkward shape. The flags are a little on the short/small side so you can miss a flag if you don't look carefully. And of course the line can freeze on the spool.
One really windy day late season (when they surface ice was melting so there was no snow to anchor them in) the wind was blowing my tipups from their holes, line, shiner and all. I had to take the vanes off and fold the legs, they reminded me of resting camels.
They work pretty well, and I decked them out with reflective tape, bells and lights for when I fish after dark.
People always stop to look at my tipups, they're hard not to stare at