I have a pair of the old Hand Jammies (not the newer version that tears easily) which is pretty good, but the Ocun gloves are even better. They are thinner so they fit better in tighter cracks, and the finger loops are of a better design than the Hand Jammies. The only design flaw is the placement of the velcro closure on the back of the hand, so it's rubbing against the rock in a hand jam. Taping around the velcro is one solution, but it would've been better if they placed the velcro closure on the wrist instead.
This review was written in the old system and had content requirements that are different than reviews written today.