I have had the SSX303 for around 3 years I think. My first game with it was in temperatures around 10C (i.e. not really cold, but not hot either), and I found it horribly inconsistent due to cool down of the mags. I then purchased a shot shell HPA magazine adapter from Airtac, a tank, regulator, and line (the aliexpress regulators+ lines are cheap and fine) - all in it probably added another £130 to the purchase price of the gun or so (and I use the HPA kit now with lots of other guns). That instantly solved the consistency issue.
I have a cheap foam filled suppressor that I use with it - this is essential really if you want to make the most out of the gun - they are super quiet with one.
Accuracy wise, I originally found it only 'average' - I added a tridos cnc hop arm and mini DC thumb screw which solved that.
I now have a super quiet semi auto gun, that is accurate out to a good range, and I can perfectly tune to be bang on the sites DMR power limit. It's a really fun alternative to AEG's/Sniper rifles to choose for the odd game, and the quietness is a nice dimension that occasionally can be devastatingly useful.