Hi, Tomas. When I first joined the RGS I had troubles with using my pinky. Now I am able to play songs with chords that use this finger. For instance, I remember how difficult it was for me to play Happy Birthday, or When the Saints Go Marching In, because of the use of the pinky. Now I can play these songs without any problem.
On the other hand, the job you do with the Monthly Practice Sessions is huge, and tremendously useful. Thanks a lot!