I have the Samsung 840 EVO 256gb as my boot drive. I have noticed an increase in boot speed. but not much else as I also have mechanial HDD as mass storage
I've only one game installed to my SSD and it runs fine with no problems.
One thing you must not do is defrag it as though it was a mechanical, SSD's use flash based memory storage. Every write that occur's to the SSD gradually wears it down but I have read that the Samsung SSD's are good for 50TB's work of writes.