I have a V10a, but didn't like it.
*it felt bigger than the other AA lights I was looking at, probably because of the lego construction. The head has to be wide enough for a CR123 battery.
*it's very slippery. This is one light that really needs knurling. It's even worse than my Zebralight SC51, because with the zebralight I could at least put grip tape around its center.
*the V10a had an excellent beam. Quite a bit of throw and the dimmer ring worked great.
*my V10a had very shoddy construction. It looked great, but I dropped the head from a height of 1 meter onto a wooden floor and something broke loose inside and this killed it. The light no longer works at all. The fall was so small that the finish wasn't even scratched, yet the light still broke??? Unforgivable in a light this expensive.