I agree that it is not worth the effort. The Decathlon is an excellent machine and has given a few people some surprises in standard level competition. But that is what it is- a standard level machine.
In my opinion whilst the aeroplane will perform many intermediate figures it will only do so if worked very hard indeed and in any event not very well. The flick roll is an example. The flicks I have flown have all been very unsatisfactory,except in an avalance where it does go quite well. It fulfills the definition of the flick roll but the whole experience is uninspiring to say the least.
There are no nasty surprises, vices or other snags awaiting in the Decathlon. It is just an honest, easy, but heavy in pitch, basic aero trainer. I think it is a lovely aeroplane. Just stick with standard level aerobatics.