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It has a light "click" when you open the blade the first 5 degrees that I don't like. Maybe some people would call it extra strong edge retention. Certainly the other one doesn't have it.
Personaly I am disappointed in the Manix 2 CF. You might want to wait for the next variation. The fit and finish on both of mine is sloppy compared to say... my benchmade griptilion
-the blades are both well off center
-there was oil dripping off one of the blades
-there is visible side to side play on both and tightening doesn't take it out
-the blade grind is sloppy, one has a burr that is easily visible the naked eye
-the carbon fiber has much sharper edges than the the Stretch II, sure looks like its gonna hurt my hand for harder jobs.
These are all minor points, but if they can't get the small stuff right how can I trust for the big stuff. And if my $60 griptilion can get it right shouldn't a $200 sprint run knife get the details right.
Nevermind, the real problem is the lock release is just to darn stiff.
Other posters have mentioned it with gentle phrasing.
I find it very unpleasant, bordering on dangerous for one handed use
(put away the flame throwers, just my opinion, I know some people love it)
It is maybe 3 or 4 times stiffer than an axis lock.
If I had bought only one I would have assumed it was defective and sent it to Spyderco immediately, but mine both have very stiff springs.
If I had handled it first for one minute I never would have bought.
Its just too unpleasant for Every Day Carry.
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On a positive note, I like the S90V and it comes sharp. I love the polished pocket clip, much better than painted steel. The carbon fiber texture is great, even more grippy than the Stretch II. Both lock up tight as a vault vertically!