I bought an R10 to use on a trip to Newfoundland last month. I went through six airports, so I had a lot of time to listen. The VHF aviation band reception was absolutely horrible. I could be in sitting in the terminal, and barely hear the tower or ATIS. Even at small airports, like Gander and Halifax, where I could see the tower, the reception was horrible. The UHF reception was slightly better. I used an earphone most of the time, so the volume was OK to me.
I am thinking that it may be due to the antenna that comes with the unit. I am going to try it with a 118-136MHz antenna and see if it works any better.
On a side note, the HF reception wasn't too bad. I used a little 24' roll-up dipole that I made, and it seemed to work well. I could hear New York, Shanwick (Ireland), and Gander HF stations very well from my location about 20 miles south of Gander.
Overall, if you are looking for a radio just for aviation band stuff, then you may want to look elsewhere. I'll reserve any definitive judgment until I can test the unit with a VHF antenna.
Jeff