Personal opinion is that it's superior to the backspring. Not only does it stay tightly shut when closed, it holds the blade unexpectedly well in the open position as well. The typical backspring slipjoint can be closed with a simple press on the blade by a finger; with the ball bearing detent mechanism one needs to actually grasp the knife firmly and push it down to dislodge the bearings from their detents before the blade can be folded down. +1 for safety.
I think SRM should try to patent this mechanism; it's clearly their own design created to comply with China's local laws regarding knife carry. Won't know about cost though.
I agree, it seems to work even better than a backspring does. The mechanism on my new 7089 is tight at the moment and since the knife is on the small side it's impossible to open with the thumb stud and hard with the flipper.
The ball bearing detent mechanism is neat though. It would be nice to have on a knife where you could just grip the blade or use a thumb nick to open.
The steel on the 7089 is "12C27". Once I've fiddled with it a bit to loosen it up we'll see if it takes a finer edge than their "8cr13mov".
I wouldn't give the 7089SUX high ratings though. It has a plastic feeling handle and the bottle opener and seat belt cutter are hinged in that plastic. There are lemons and gems for sure. Some SRM knives I like are...
7010 (the ubiquitous, great for gifts)
A103
A123
A146
A169
(A*** is your "scalpel" set of 4 sizes)
4107 (for a little watch pocket knife)
YMMV
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