Enerjet E24(-4, I think) - back around 1970. Ended up flying it in my Centuri Saturn V sometime after that. Lifted off pretty good, proceeded to 'lay over' (i.e. pitched over to horizontal) about 150 feet up (don't know why) and then accelerate to 300 mph (my guess). Nothing ever really bad happened - it ejected before it hit and there was only minor damage (IIRC). A year or so later, my *2nd* composite motor was the Enerjet F52 (got 3 of them), but never flew any until around 1989 or '90 - and that was just one flight -- in a scratch built 'Super Goblin' (2.6" dia). Got off the pad rather smartly and then, the progressive thrust kicked in and the thing just jumped out of sight (on a single, white point of light -- no smoke). Still have 2 of those F52s, but will probably never fly them (my guess - too much of a collector's item any more).
-- john.