I think it really depends on how you use your knives. If you gunk up your knives with stuff like I do, it's awfully nice to be able to take it down, clean it up, and re-assemble it so readily. Years ago, I once called it an exquisite puzzle sent from the Gods.
Having carried Benchmades exclusively prior, I could not take them down as easily, and developed spot rust on the 410 liners from gunk and sweat, that albeit removeable, was always recurring. I didn't want to give the Benchmade up either; love those Axis locks. Even tried a Sebenza for a short time and sold it, only to return to it about a year later in 2002.
It carries very flat in the pocket, and is as strong as a folder its size truly needs to be.
The Sebenza is a tool and an heirloom all in one, backed by some of the absolute best folks in the business.
So, I think it depends on how you use your knives, but I also think it depends on your level of expectation from your knives. I'm a knife guy above all else, so of course I've spent years seeking out the best for my money, so to me, the Sebenza is a bargain.
Professor.
Edited to say: I realize you requested to hear from folks who were not necessarily fans, folks who perhaps tried the Seb and didn't like it. I just wanted to give you perspective from someone who initially tried it, didn't like it, returned to toting Benchmades, and came back for a second try. The second time, it took. Truth is, there's happiness to be found in plenty of other knives too, and Benchmades are fine knives.