I've also got them front and rear and they're the strongest option out there. They are also the only option for a selectable locker which is very important when you drive on ice 5 months a year. The only issues with them are they do have to be properly installed and they are more expensive but you get what you pay for. The first time mine were installed they destroyed the front locker, gears and bearings but replaced it all and regeared both ends for free. Make sure you use a certified ARB installer or else when it blows up you're screwed. This isn't a job for a first timer.
I also use my front locker quite a bit but that's probably because I wheel more than Hytenor, he's scared to leave the board for a day in case he misses a thread.