After studying my CF Positron since Monday and spending some time learning holds, grips, flips, flicks, and tricks I love my new Positron. It will never replace my workhorse Delicas and Enduras, but it is a well designed cutting machine which I find easy to operate after a bit of practice. Things I've learned which may help.
Holding the knife firmly with the butt on the base of your palm helps insure a solid sharp index finger flick on the opening stud. A solid flick will send the blade sharply into battery. If the finger flick on the heavy blade does not generate enough inertia the blade will only open partially. A partial opening is quickly remedied by a wrist flick to fully deploy the blade. With a bit of practice the opening finger flick will become natural and reliable.
Lightly push outward on the release lever. The blade should drop out of full lock and stop on the ball bearing thingy. Move your finger clear of the release. Push on the back of the blade to close it fully. There will be some resistance. Do not expect the blade to free drop to the closed position.
I've carried knives rattling around in my pocket with coins and keys for most of my life. Only recently have I started clip carry. The beautiful carbon fiber scales of my Positron will not be subjected to a bottom of pocket tumble with who knows what. The clip fits my hand and adds support with many holds I experiment with.
I transitioned from Buck 500/501/502 knives to a Delica eight years ago. I did not particularly care for the Delica at first. I took the clip off for bottom of pocket carry and grudgingly learned it was not like the Bucks I had carried for years. It required thumb training, a little differ grip, and that clip thing... there might be something to it. Then I realized how great the Delica is. Eight Delicas, four Enduras, one Dragonfly, one Tasman Salt 2, two Manbugs, and two Ladybugs later I'm falling for a discontinued model that wants my index finger instead of my thumb. I may buy an orange Positron before they are all gone.