Running my Solarstorm with torchy's 6 cell battery. So far so good.
Beam pattern is not a sophisticated as my vision 4, one definately spot and one flood.
I'm using it with my vision 4 for night time technical singletrack riding and it's working very well so far.
Only minor niggle is the battery to head unit connector, the original battery has a screw connector and new 6 cell doesn't. So it will rattle loose, a little bit of electrical tape holds it in place.