Lawyers pretty much freak out over it if there's even a hint of using GPL software in a product. Not so much for tools, etc, but they get pretty adamant about it in stuff that touches the product code (this is admittedly vague) in my experience. I won't touch the stuff for commercial use, personally. Not once in 10 years have I not been able to find a suitable non-GPL project that did the same thing as the GPL code to meet my needs. In my opinion, using GPL is a pretty solid way to stifle a project. YMMV.