Toyota have had so much experience with Hybrid powertrains and they are renowned for reliability.
Checking that the car has been properly serviced and has had recommended hybrid health checks makes common sense.
The big service is 60,000 miles when plugs are changed so that is worth accounting for.
I have stuck 11,00 miles onto mine since June and it runs beautifully.
The only issue is that I am waiting for Lexus to sort out my lacquer coated alloy wheels which are corroding around the wheel centre caps, so if you choose and Advance model check that.