We fly into 36U (Heber City) periodically. While a great airport for primary training, it is a mountain airport and only has one approach. During the winter, we go into SLC to avoid last minute diverts or getting stuck at departure time. The departure has a hefty climb gradient as well.
The folks at OK3 all seem nice, but as the above posters pointed out - when it's you and the CFI in the plane together is where the quality of training matters.