I bought one of these babies at a little knife shop in Steamboat Springs, CO about a year ago. I carry it a few times a month and my experience pretty much matches yours. It's an extremely light, extremely sharp light duty slicer with a well-executed button lock. Mine has held up well and still locks up with no discernible blade play. I don't baby it by any means but I'm not exactly batonning wood with it either. The thing is, I know almost nothing about the E-6. The William Henry brand isn't that well known and there isn't much info out there about this knife. I have no idea what steel mine's made out of but it could be the M390 you mentioned as it hasn't rusted at all since I got it. You mentioned the designer and a few interesting features in your video. I'd be really interested to read more about the designer and any other details you might have about this knife if you do a write-up. As always thanks for the great review.