I know I will catch some flack for this one, but...here we go.
It is a matter of opinion on if Gateway discs are known to be beefy. Right now, I would say no, just because they have a wide array of discs that are overstable to understable. They do however make a few molds that are probably the most overstable discs on the market (ie. Speed Demon, Spirit and Demon). These discs definitely have their uses. I carry a Spirit and a Demon.