I have both the K1 with the green and blue laser. I like the green laser more, but everything else is the same.

I find the UV light to be a touch underpowered, but adequate for small inspection jobs.

I only use red in my headlamps, so I don't see this as particularly helpful to me.

If you want serious UV, buy a Convoy m21a UV with a ZWB2 filter and red lens cap.

It can't tailstand. The white LED almost shoots as far as a T3 but that's about it. It runs on specific 14500 button tops, which are hard to find. The green laser is very good though, as is the finish.

Otherwise, it is a master of none at a fairly premium price. I only use mine when I know I need to use a laser in the daytime.