I think its a good idea, but it is important to be very comfortable when flying aeros.
Also it would be difficult to exit from some aircraft type.
I used to wear a chute when flying a jump aircraft but it never worked really well with the cessna seats.
I think it was last year when a Skydiver hit the tail of a Cessana Caravan after leaving the aircraft, the pilot lost control and had to "jump" the pilot got down safely but the guy who hit the tail died.