Thanks for all the input folks, sound in general a cracking bit of kit and I think will go for one. Was thinking of the colour skymap but the greyscale on this product does seem to be quite effective and along with all the features seems the dogs bollocks! once again many thanks.
EGNT: Cheers for the info, I had read the report which I feel isn't quite as deep as it could be, so the input here is appreciated all the more.