I just set up a used G36 to suit my own tasts and have been shooting it for the past two days to get used to it.
I shoot reloads for economy so I put a BarSto barrel in the G36. I sent it to them because from past experience their semi drop in barrels sometimes aren't. When I got it back I installed a OEM 3.5# connector and the NY#1 trigger spring. This is my preferred trigger setup. I also installed an Ashley Standard Dot tritium front sight and an MMC tactical adjustable rear with their new express style notch. It is a shallow "V" like the Ashley but adjustable. It has a tritium bar at the bottom of the notch giving a "Dot the Eye" sight picture in low light. Finally I stuck a Scherer Slug-Plug in the bottom of the grip. I have medium to large hands and this gives me a better index of deflection.
First shooting session I put 100 rounds of my ball duplicate reload through it and roughly sighted it in. I then fired 50 rounds of my carry load, the Federal 230g Hydra-Shok. No malfunctions were noted with either load or any of the 4 magazines I have.
Next day I went back to the indoor range and (without cleaning the G36) practiced from the holster and ready position at 3, 5, 7, 10 and 15 yards. Again I shot 150 rounds.
The G36 recoils more than the G30 (which I also have). This is not a surprise as it is a good bit lighter and as noted above the G30 grip spreads the recoil over a wider area. The G36 reminds me of the Lightweight Officer's ACP I used to have, although it feels even lighter. It is controllable with a solid two hand grip but does take some work and concentration.
I also fired several magazines strong hand unsupported and weak hand unsupported. No problem strong hand, just slower in recovery. Weak hand I could actually hear and feel the slide going into battery slowly, meaning I was breaking my wrist. This will take some practice.
Biggest problem I noticed was that due to the smaller diameter grip, my trigger finger is engaging the trigger differently than on the G21 or G30. This led to some trigger control problems. Nothing that practice won't overcome but it was different than what I'm used to.
Hope this helps a little. YMMV!