Several Joysticks, alll flawless, though I did manage to lose one on a snowy night ride in the Nidd Valley, doh, and currently a Diablo I with a Piggyback as a helmet light on steroids. Ansolutely superb, great light and beam pattern and never misses a beat. Also run a couple of Red Eyes - the Smart Port stuff is ace for that, though it does mean you can't run a Piggyback simultaneously.
Downsides? The charge times on the larger batteries are long(is), I've seen 12 hours or something quoted for a Six Pack and the Piggyback Triple seems to take for ages. Apparently better for the battery, but slow and hopeless if you're disorganised and forget to put them on charge. And on a really long ride, you can't change the batteries as you can with a remote battery light.
On balance though, mine have been superb. I like the Diablo as it's light enough for your head, but also makes a neat, easily portable bar light for the road etc.
