I heard the 2.4L engine in 08-09 weren't too reliable, so how reliable is the 2010 Toyota RAV4 2.5L engines?
It the car spacious enough, does it come with a AUX port, does the AC work very well?
I had 2009 Honda Civic and the ACs are horrible on any 06-11 Hondas, it leaks and the compressor goes bad so I just hope that the 2010 RAV4 AC doesn't have much issues.
See the following to get an idea of failure trends on that model:
https://www.carcomplaints.com/Toyota/RAV4/2010/
However, you are looking at a 14-15 year-old vehicle so reliability and whether accessories like AC work well is going to depend on how it's been treated and maintained during that time - and anything can break at any time due to age. It's essential that a good mechanic give any used car you are considering a thorough examination before purchase.
For features check the owner's manual. Also see Vehicles Reviewed by Scotty near the bottom of the main page.