I have a set of Denise that I'm very happy with. The only drawback is that one of my connectors has evidently worn, so sometimes the needle pops off the cable if I put too much pressure on (as when sliding stitches).
I especially like to use the set for knitting gauges because I can easily switch needle sizes by just popping a new one on the cable. I also use a needle without a cable attached for binding off. I can drop a needle head into my project bag that's out of the way until I need it to bind off, since I usually bind off with a larger size needle than I knit with.
The cables make good stitch holders, too - just pop a needle back on to resume knitting, rather that transfer back and forth to traditional holders.