Cor.

A full 7.5 grams lighter than the Helium. Let's hope there's no mass recall this time.

Well price is everything to some, weight is everything to others. Personally I like DMM's roller 'biners ( http://www.dmmclimbing.com/productsDetails.asp?id=&id2=76 ). There is no doubt that these extend the life of your rope so will save you money in the long term. However what DMM's blurb doesn't mention is how nice it is to fall off onto these 'biners. Falling off onto one feels much smoother and softer than with ordinary krabs. Perhaps this is because, as DMM says, "the forces ... are more evenly distributed throughout the system" with these krabs. Whatever the reason for anyone into redpointing more than onsighting a few of these in the rack are well worth having. I don't know how well these krabs are selling. My guess is that the marketing of these appeals mostly to more nerdy climbers who never fall anyway. Maybe DMM should distribute some to climbing walls so more climbers get to feel the benefits for themselves rather relying on technoblurb. I'll certainly be buying a few more before my next trip away anyway.

I've got a couple of the DMM Revolvers on extendable quickdraws, and I tend to use them on long trad routes to reduce the rope drag. I think they help, but of course unless you climb the same route again with normal quickdraws, it is hard to know for sure!