I must agree with Mark Blabla as I have it on a MBP 15″ as well, I work in the web design and development field in a room full of windows fans so I must be able to seamlessly work with windows machines. That was a very simple task with Snow Leopard only require the minimum of effect. Now with Lion it has been a real challenge to even get OS X to talk to the window boxes let alone play nicely. Unless I can figure something out I will be forced to retro grade (upgrade) to snow leopard to simple get the stuff done I need to do.
For a Upgrade Lion sure feels like a down grade to me!!! Of course this is simple only my thoughts based on my experiences im sure if all you work with is apples or the few windows setups that lion will play nice with then you will be fine. We also have a Terastation here and I had to fight for almost a entire day to find a solution to even get Lion to connect to it and then it doesnt do it well.