Yes - everything still works and gets exercised to make sure! Pottering around with dolphins is a good way to work the aux for a bit. I sometimes do the "Hey look I've got twins" thing and put the aux full ahead and the main slow astern to do 360s
Gear selection was a bit sticky around year 2 but was sorted out and is now fine. The only other issue I had was some dirty fuel which blocked the carb (on a test run), but I now take the whole internal tank out annually, empty it right out, swill it around with some clean fuel and refill with fresh to prevent a reoccurrence.
All comments noted, the problem here is needing to make ABSOLUTELY sure you've got everything to hand before pulling it to bits as it takes weeks to get anythng missing down from UK. I'm currently going through that process to get all the bits for the main engine and if I get that job behind me with no problems then I'll turn to the aux.