In reply to taffyboy: First, which one? There are three. Second, what do yu want it for?
With a decent search you should be able find a few threads on here and on other forums over the last few years discussing the various pros and cons of the three different versions of the WC Ropeman, along with alternatives such as the Petzl Tibloc, Petzl Micro Traxion or Kong Duck.
If it is just for emergency use, then most people I know (including myself) now carry Petzl Tiblocs. For regular use, proper handled ascenders are better, or a caving systems using petzl Croll/Basic ascenders.
However, for other things like crevasse rescue it seems to be a toss-up between the Ropeman Mk3 and the Kong Duck, e.g. see
http://www.ukclimbing.com/forums/t.php?t=509187