I've been adding more and more micro-carabiners to my rack, mostly for racking cams and for the free biners I carry on slings... and especially when I'm doing long approaches into the mountains. And of all the micro-biners I've tried, my favorite is the Omega Pacific Dash with the new Infinity wire gate.
The Dash, which was introduced in 2009 and is named after the late Micah Dash, isn't the lightest or smallest biner on the market, but I find it the easiest to handle of all the mini-biners I've tried. Key to this is the Infinity gate, introduced this past summer on several Omega Pacific biners. The gate is pinched in the middle to create an hourglass shape (or inifinity symbol), which provides a sweet-spot for grasping the biner with your thumb or forefinger when you're clipping or fumbling for gear on your rack.
Omega Pacific also cites some other benefits for the Infinity gate: It's lower-profile, so it's somewhat less likely to accidentally open when the biner bumps against something, and the pinched gate has less of an opening to snag on other gear or clothing. But for me, the handling is the primary benefit. OP wasn't the first company to slim down its wire gates, but this is the most user-friendly design I've used. A "Dash Pack" of four biners, color-coded to match OP's Link Cam sizes, retails for $27.75.