OK, it's arrived (very quick service seeing I only ordered it on the 16th).
First impressions are good, the readings are pretty accurate and it does not seem fazed (so far) by most surfaces. The stated accuracy of +/-2m seems to be about right. It claims to work out to 400m and I have no reason to doubt it so far, but I'm not interested in shooting to that range anyway! I've trialled it on a known 100m distance and it was spot on.
It's not so good if there a few branches in the way, but I'm working on the principle that I won't be using it in thick woodland.
If you want a heavily rubber-armoured model I'd spend your cash on something more expensive - I wouldnt want to give it too much rough treatment and expect it to come up smiling. For the price, though, it's light and compact to carry around, and for checking out a slightly longer shot or setting up a target for check zeroing in the field I think it will do very nicely.
Will come back to the thread if I discover any major drawbacks.
Mole