I bought the 175mm version and it's ok...nothing special. The beam goes out a long way and is very tight so if you like it like that then fine but which i don't particularly like it. I had to re-solder all the connections as they were crap.
Mine is sitting there doing nothing after only a couple of times out.
Get a lamp that's tried, tested and comes recommended as you'll end up selling it on for peanuts and buying something better. Have a look at the Cluson Lazerlite...excellent wee lamp and more than adequate