i own the 2014 model the first gen. it's a good car actually just normal wear and tear, no major issue.

i was quoted 6k recently to sell the car but the price is just way too low so i just keep it as a spare car

210k plus 

iRiz, Persona family suffers from rusty radiator resulting in overheating (because workshops add tap / mineral water) so inspect, if not too bad can flush coolant and change every 40k kms or 2 years (use premix for peace of mind since no need to mess around with ratio and just use coolant).
Coolant is a vastly overlooked item and if left unchecked for too long will potentially eat into gaskets resulting in an expensive head gasket failure.

Next would be the window motors / regulators leading to failure to roll up the window(s).
Solution: clean window channels, spray silicon lubricant from time to time to ensure smooth operation.

If youre into safety, the Premium came with 6 airbags compared to lower spec iRiz

About the GB, its not your conventional 4AT so youd have to tune your driving slightly, release brake then let it move baru tekan minyak. The newer gen CVT is to me improved and more refined. Some backstory here is that Proton knew of such issues, asked Punch (CVT manufacturer) for help to tune but they didnt bother because well Economics of scale, Proton is a small player. This changed when Geely asked Punch to assist thus the refinement.

With most or all 2nd hand cars, do go in for major service especially if you do not know its service history. Timing belt, water pump (since its next to it je, would save some money to do together), EO, CVT Fluid, CVT filter, oil filter, cabin and engine filter, spark plugs, plug coils (be prepared for them to break if they are old so be on standby and its cheaper to buy online than to go hunting if you discover its broken during change), brake fluid, alignment balancing.
MT owner here who picked one up where the previous owner changed the pump. I think what many people miss out on is brake fluid bleeding / flushing as the fluid is shared with brakes and clutch pump. The bigger one that most miss is doing the same for clutch, did mine and it was dirty.

You can search iRiz restoration on youtube if youd like to see the video.

Might i ask which year iRiz youre considering?