In reply to mikehike: In sizes 1 through to 3, DMM 4CUs are absolutely excellent and offer superb value.
The twin stem design is at its best in this size range, making 4CUs in these sizes pretty much the lightest cams available and still easily some of the best. As such, provided you generally get on with the trigger mechanism (some people don't) then the 4CU offer you link to definitely provide the most 'bang for your buck'. Also 4CUs offer sizes 1.25 and 1.75 which are great as it means you can buy them rather than needing to 'double up'.
However, in the smallest and largest sizes, the intrinsic limitations of the twin stem design mean that dedicated micro-cams are MUCH better at size 0.5 and below and at 3.5 & 4, single stems designs are more 'solid', flexing less whilst you place them and can be lighter as well. The issue with smaller cams is vastly more important - I very rapidly sold my small 4CUs and switched to Wild Country Zero cams but I happily kept hold of my larger 4CUs for many year as the better (and lighter) alternative of DMM Dragons then didn't exist.
HTH