I gotta tell you guys, I feel like one of the main issues detracting from frameless or frame-stayed varieties is the lack of an option to "try them" before hand.
They're all so different in how they interface with your back, and everybody's physique is different.
If the SMD Starlite had been my first LW pack, I'd have probably given up trying to find a frameless or lightly framed pack, because the SMD just didn't work for my back.. My friend that now has the Starlite I had, loves it and claims he doesn't feel it even with 30+ lbs.
The weight never bothered me with my GG Gorilla, but the straps I could never quite make work for me. The pack fit me, but the straps didn't.
Is there anything wrong with either design? Hell no. They'll work for the right person.
I used a Gregory Forester for a long time back in the heavy days. One of the most loved beefy frame packs ever to exist. The size was appropriate to my torso length, it has more padding than a couch. My back has never hurt as bad with any frameless pack at any weight as it had with normal wt's using the Forester.
Unfortunately, we buy frameless packs based on subjective reviews, hype, style, features, wt, whatever, and those are all the wrong reasons. Plus, we're all skeptical of them even though we want them to work so badly.
I'm using a MYOG pack now, completely frameless, with straps that I love, but I've also got a beast of a special new external frame OTW, which will definitely see some use, so long as it turns out to be comfortable for *my* back.
"YMMV" has never been so relevant to any category of gear in my opinion.