it's proprietary. well, it is based on a gpl thing (wine) but they chose to release some halfassed addons that are proprietary (also you need to rent them, you can't even pay a oneoff fee). Also, i gather they used an older, non GPL version of wine, so they wouldn't have to contribute their code back to the community, so basically they are making money off of other people's sweat and good intentions.
although i don't know much about it, and i have never used it, so i could be wrong!
edit - also, it helps you run windows programs which just keeps the shackles on for that bit longer. why run linux if you're still fucking using MSword? and more to the point, how will game developers realise people want their games to be released as linux natives, if people are all renting copies of wineX and buying windows copies of the games?
[ November 20, 2002: Message edited by: Calum: Linux Commando ]