I think the only tools I have bought for my heli is ball link pliers. I don't even know what JIS screwdrivers are and the allen wrenches that came with my raptor work fine. No sim either. I've been flying for 10-11 months and I am getting decent at aerobatics and I'm working on inverted hovering from high up. No crashes yet except for a minor incident costing $25. No balancer either. I borrowed a friend's to ballance my woodies when I started and then to check my SABs later on. Havn't needed it otherwise. Just recently I decided to invest in a Sirius Pro so I can fly more.

Oh, I forgot I did buy a pitch gauge too, but I didn't even have that during the first few months.