There's been a question or two about these units on here and other sites, and I did consider them, as I lamp alone and I wanted to reduce the weight I was carrying, but still be able to shoot out to at least 250 yards.
I went for a Tiablo A10G, in the end, and I'm very happy with it. I did add a deben scope mount (as the one that comes with it is a bit fiddly), and fitted my own rocker switch which I attach to the fore-end with elastic bands.
The beam is very tight, and I can positively identify foxes to well over 250 yards, and you don't notice any difference in weight when it's on the rif