After getting these cams about a week ago and climbing 5 days and 20 or so pitches on them I have come to a few conclusions:
For trad climbing, these feel nicer and the large sizes are noticeably lighter than other twin axle cams. Sticking with the BD color system is great; someone says it takes a red, bring a red (#3). The extendable sling keeps from having to use a draw, although some fiddling might be required to keep the stitching on the correct side of the biner; if you're placing in a difficult spot it can be faster and less taxing to clip a draw or put rubber O rings on all of the slings.
The biggest drawback I've run into has been aid climbing. They're not as easy to clip in and don't get as high as other cams since you can only clip the slings.
If you're looking to supplement you rack or rarely aid these are well worth the extra few bucks.
DMMDragon Cams rated 5.0 out of 5 stars from 1 reviews.