Shaggy Sheep Driver continues the old myth about nasty spin characteristics on JP's. I have spun 3's and 4's on several occasions and found that they all recover quite happily if the correct technique is used. The thing to remember is that they do tend to wind up really fast and will easily lose 5,000 feet in the process, so it is not something to be trying under 20,000 feet or so. It is also something that should not be happening unintentionally, with incipient spin recovery being effected by closing the throttle, centralising the controls and waiting for the aircraft to assume a happier flying attitude and airspeed.
The bang seats, if live, will work from ground level as long as there is 90kt forward speed - at least it's an option that most light a/c don't have!
The climb-out may be flat by modern jet standards with full tips, but it'll happily make 2000fpm at 160kt on mains. Not too shabby for a 40 year old trainer.