I haven't spent much time putting on a Discatcher Sport, but I fart around with M-14s from time to time. I haven't seen any issues with broken welds on the ones I shoot on, but holy hell are they rough on the discs! I spent half an hour putting, and my discs looked like I'd been throwing them across a gravel parking lot. I don't know what does the damage, if its rough chains or the nubs on the cage, but something chews the plastic up. Also can't say for the Discatcher Sport, but in the case of the M-14 (and Mach Lite, for that matter), there's a good number of putts you just have to tell yourself you know would have stuck on a real basket.
Other baskets--I've heard nothing but good things about Lightning DB-5's--apparently one of the few Lightning products people like. And I don't know if the reason you're looking at portables is for cost or portability, but, if you're willing to splurge a bit, the Gateway Titan
is supposed to be the best catching basket out there.
Edit: more info on the Titan
if anyone's curious