It is an economy package, but it doesn't mean it won't last quite a long time or that it isn't quality. If you abuse your gear, the DSS does have a thicker internal bladder, but aside from people pinching the bladder, I've never seen a bladder fail..... The DSS plates are a little bit nicer than the HOG plate that comes with the Trianta set, and if it was March and the Trianta was at it's normal price of $380, I'd say sure, the DSS is worth an extra $90. At the same time, it is currently on sale for $330, and I'm not sure the DSS is worth an extra $140.
Not sure why everyone is bashing STA's right now, or why you would be removing the wing regularly, but whatever. The DSS plate is a pound and a bit lighter than normal plates, so it is better for doubles since it isn't quite so heavy, the extra 1.3lbs does make a difference. Call Tobin up, see if you like him, if you value made in USA, DiveRite, OxyCheq, Halcyon, and Deep Sea Supply are your only real options for Made in USA wings. Oxycheq and Halcyon are in Florida and are $$$, DiveRite comes out of upstate New York, and DSS are made in California by a gun toting republican who is a rather opinionated, but very cool dude if you click with him.