Crispy.Yeah. I'm trying to decide between them and AR7s. Though I don't hit too many jumps over 40 feet, I am stronger than your average park skier at 6'2" 190 lbs. I ski the midwest. I've had some trouble with ON3P edges in the past on more than one pair of skis (which baffles me because of all the rave reviews they get on here). Any insight? My old AR7s were the only ski to last me an entire season haha, but the presters are tempting.
A lot of it comes down to how you treat your skis - I typically detune heavily before they touch a rail, gummy stone regularly to decrease burs that might catch and cause a crack, and if I do get a crack I smooth it down so it doesn't continue to catch. While this will work on most skis, the thickness of the edges does help them last longer.
As far as picking between the Prester and the AR7, I found that the Prester carves better than the AR7 (especially when center mounted). The AR7 and Prester both have an asymmetrical sidecut, but the recommended mounting point of the Prester is at true (measured) center while the AR7 is at -5cm, this means that the ski was designed to carve well at center while the AR7s aren't necessarily designed to be skied at center. Also, I love stiffer skis, they just seem more stable on all conditions, so it comes down to person preference, but at your size you'll enjoy a more stable platform and still be able to power butters and presses out. The other thing I love is how the skis love to be driven, a lot of park skis these days aren't designed to be driven, they're just meant to get to the park, the Prester can be railed around on groomers like a GS ski (well, almost like a GS skis -- I wouldn't race them through gates or anything, but it could be done) which makes them a really fun ski all over the mountain.
It's really up to you, if you're worried about them, that's understandable, but honestly, I love my Presters. I found myself skiing Presters most of the season until it became heavy slush, then I went with the Kartel 98 to surf around on.
