I have a 2008 2 x 2.8ghz mac pro with 16 gb ram, a gtx 285, 4 hdd including a boot ssd and a bluray burner. I do mostly FCP (not X) and Photoshop editing, along with the usual lighter computer stuff like internet, emails, etc. I run OSX SL 10.6.8 and everything works well. I have avoided going to L or ML because they seem to be obsessed with ios gimmickry rather than useful performance enhancements like better memory use, better multi-core use, etc. I have no need for the ios gimmicks in ML, but I have noticed that some apps require the use of L or ML rather than SL. My question is, are there any real benefits in terms of computer performance and the use of resources that ML has over SL or is it all about added ios gimmicks? And would going from SL to ML create any compatibility issues with my current software and hardware? Thanks for any advice.