Welcome.
A 1yr old vehicle of any marque is most likely being bought through the Dealer, so everything should be covered, by dealer warranty, so no worries. Reliability can vary from vehicle to vehicle . It has been known for a brand new vehicle to spend a lot of it's first year in the workshop
@Tigger Eeyore & Roo , can tell you about that. Or it may not see a workshop until well after it's first MoT , for anything other than basics.
Without undermining the site, or the marque, you shouldn't be visiting us before even buying a one year old vehicle. Someone looking at a one year old vehicle, any marque, should not be buying it, if they are already worried about reliability. Harsh but true!
Also we do not have a lot of one year old vehs on the site, so there is little real life experience. There are maybe a handful of members playing with a 1yr old Range Rover but not enough to give a wide review. Go read some dedicated review sites, see what places like honestjohn,etc, say.
If you buy it, come back when it breaks down, then we can try to help