You will need to do differences training (Compulsory under EASA) or fly with an experienced 525C pilot for a bit, it's not really the same aircraft initially.
if your moving from a CJ2+ the transition will be easier.
Doesn't seem to get any where near to MMO at highish FL, lack of excess power when compared to the CJ3, however the speeds are higher, so I am not comparing like with like.
Fuel burn is nuts in the initial climb. Single point fuelling is handy.
Caravan toilet still a bit embarrassing, but better than a CJ litter tray.
Looks like the cabin temperature control might do something, although there are still random temperature changes in the descent.
The Collins integrated Avionics are great, with two FMSisses they allow either pilot to auto tune and wonder if its going to capture.
Beautiful aeroplane, close to a finished CJ, better perf than a Phenom 300, but less ramp presence and no window in the toilet. Overall the most pleasant and impressive CJ so far.