hi merlecollins
becareful where you buy one of these dw087k's! there loads on ebay that are reconditioned. i bought one from a dewalt center because i was talking to one of their guys and they claim many get damanged in transit so if i were you, pay a few quid more and go to a store..many will knock money off in this climate so be pushy but polite...i like these lasers and i wouldnt hesitate to recomend them for small to medium sized areas...the dewalt dw060k floor laser square is great too!
dont be fooled by the robustness of them, if you drop them, the damage easily ie small glass, damaged diodes, etc etc so look after it..
i would only ever buy 3 brands of lasers...dewalt, pls, hilti
hope this helps you out mate
Ed....