The best place to learn about the Avidyne is by reading the books and maybe using the PC Sim.
It is crazy to be blowing money trying to work it out in the air.
Then it comes to the point of how many of the 100s of functions do you use?
At the end of the day you fly the plane not the TV screen!
I agree the majority of the Garmin & Avidyne stuff is best learnt on the ground but does need to be practiced extensively in the air.
While of course you fly the plane and not the TV screens if you are going IFR or doing instrument approaches believe me you had better be pretty good at flying those TV screens and use the GNS430's with ease or else you are going to be in deep sh1t.