Granted there detectors ain't the best but think there panels work as they should. Bar the odd lightening strike can't recall last panel that just went faulty that I've had to replace.
We use Pyroñix as one of our main panels and in all honesty I find they give far less problems then galaxies do. The amount of high res and low res issues galaxies cause whereas Pyroñix rarely causes issues with detector faults.
The newer type electronic shutters that have the rubber seal at the bottom and thin Ali with what looks like hard foam in between the inner and outer skins
Got called out to this today. Bell faulty and 15 min cut out not working. Removed power and had to leave on battery. God knows how long before that runs out. Told customer to call sign people out so we can access our bell. Can't believe how thick some people can be installing that sign over bell box.