Ascend quickly, carry no extra weight!
I love my tiblocs. I generally prefer not to carry extra equipment on me, so after trying various ascenders (for canyoneering, so I'm not doing huge ascents), my preference was various cord ascenders (bachman/prusik/valdotain/french braid)... until I encountered a particularly difficult 200 ft ascent, and now I'm 100% happy using the tiblocs. They go over edges very nicely and add no weight to your harness. Caveat - use a small accessory cord so you don't drop the tibloc, since you have to take it off your biner to clip it to the rope. AND, make sure the biner is set in place before you weight the tibloc EACH TIME you move it - or you'll have a messed up hairy rope!