Bryan K.wrote a review of DMM Dragon 2 Cam on April 6, 2017
Familiarity: I've used it several times
I absolutely love everything DMM makes and the Dragons are no exception. If you're on the fence about getting them instead of Camalots, I think they are totally worth it but it really depends of your preferences for handling and features. Personally, the lack of the thumb loop is no issue for me, as I think the cams are just as easy to handle as Camalots. I have never once fumbled with them in any way when on lead, but if you really love the thumb loop, then stick with BD's as they are awesome too and a bit cheaper.
The feature you get in exchange for the lack of thumb loop is the extendable sling, which I LOVE!!! It extends about as far as a quickdraw does but does a better job at preventing walking because the sling transfers very little rope movement to the cam. This also means you don't have to carry extra draws just to prevent cams from walking, which saves A LOT of weight. Taking 8 draws, averaging 3-4 oz per draw, off of your harness saves 1.5 to 2 pounds! It also gives you an option to prevent carabiners from being loaded over an edge, which you can't do without an extendable sling.
In further comparison to BD's, the color coordination is the same and their range is virtually identical, so they make great doubles to a set of Camalots. However, Dragons use a lower camming angle (13.75 vs. 14.5) so they have better holding power in the outer extremities of their range. Just watch DMM's video of a Dragon picking up a 1 ton boulder in an undercammed placement to see what I mean.
The only issue with them as compared to Camalots is that the sling will wear out faster, but they still last plenty long and there are now plenty of resling services for them here in the States.
Overall, Dragons are killer and are my personal preference for cams. They are supremely smooth to handle and are bomber pieces of protection. DMM really got it right with these cams. I only wish they would make some micro cams now!!!