i've got a makora fireant double plain edge and really really like it, its my favorite OTF auto, i really like the design. i dont carry mine too much, only occasionally, mostly open mail with mine lol, but i have played around with it quite a bit and they are much sturdier than ya would think, i have opened/closed mine hundreds if not thousands of times and its always worked fine, gotta remember not to over lube though, i like the red handles on the fireant better than the black FWIW, great knives though, of all my knives its my sons and my girlfriends favorite, she said of all of them its the only one she can see being worth $400, if that means anything lol.
the scarab and others are cool too though, i just slightly prefer the makora.
as far as being worth it, they are imho worth it, most any decent OTF is gonna run ~$350 or so so they are right in line with other models/brands, i very much prefer microtech for most any style auto, there OTF autos have every other production auto all beat to heck imho.
i have really enjoyed playing with mine.