Well when i go to skateparks there are plenty of people with Gsport rims of all types. And i think out of 100 people i have seen with a gsport rim, maybe 4-5 had any trouble. The spokes look as if they normally only pull thru Birdcages and i saw one ribcage that had a small crack (it was older than old and pretty beat on). I think it really depends on the user. And it comes down to whether or not you over tighten the spokes, or not tighten them enough, and land 90 a lot. haha causing cracking etc. I doubt they would mess up for you though, im sure since you have been riding so long you know the proper tension to set to a spoke. But i have seen even more people with Sun Rims and NOT ONE had any trouble. I think that says something for those rims. They dont pull thru because its like reinforced or something. But im sure Gsport rims would do you fine! Just dont go in with a 10 foot long spoke wrench and crank em down as far as they will go. And dont neglect (IF) they get loosened.
References: OneGuyIlluminatiEye, robinson79, Brian Griffin, The Horror Contact, StoreBoughtChild, C_Johnsonbmx, dkTechEthan, etc.