I've had a Mini-Grip for... almost twenty years now, so my idea of a "reasonable" price is probably warped by the "back in my day" phenomenon.
Never had any experience with Lionsteel, haven't been able to talk myself into one.
Part of the problem is that we have a very large community of enthusiasts, and these are production knives. There are going to be problems that slip through quality control, and it is in the nature of the internet to make bad things seem bigger than they are. I would want to know a lot more information about these problems with m390 before I believe that they are worth avoiding.
I think the Bugout and Grip are perfectly acceptable knives, it's just that I also think better alternatives exist. Doug Ritter does good work, and sales of the RSK support him. Hogue is an American company with at least as good a reputation and manufacturing process as Benchmade. Add those together, and my opinion is that the RSK is the "better" knife, not so much because of what it is, but because of where it comes from.
Lionsteel is in roughly the same price range as Benchmade, although they seem to be aiming at a slightly different demographic. I like their designs better, that's all.