I'm about to buy a new laptop that I intend to use primarily for software development/testing/debugging and was wondering if it is safe to get one with Windows 8 pro OS installed? Or should I stick with Win 7? 

I primarily do MS based development (i.e. visual studio, .net, IIS, sql server), but I also do a lot of PHP/Apache/Mysql work as well. I dont want to get into the situation where some software tool I use works in win7 but not in win8. 

Anyone know of any issues I could come across on Win 8 or any software tools that doesn't work on Win 8?

Also, does anyone find themselves less productive using Win 8, in terms of speed to get things done?