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It's pretty good, although the hexgrid is as poor a choice as always for dungeoncrawling and mapping buildings, and it's still vaguely annoying that increasing DEX helps loads on offense but only minimally on defense. It (and GURPS, its linear descendent) would have done better with opposed die rolls, which was something people were saying way back in the Eighties.
I can't see any problem with this - but perhaps I'm overlooking something.
It's really ugly. Aesthetics matter. ...You can make hexes work for building and dungeon mapping mechanically, but you will never make it look entirely right unless your party is exploring an insect hive.
are you able to buy from a store in the UK - or do you have to order from the States?