Amen.i still use it on my 2010 mbpro.
very smooth, totally stable, quite fast, and (sorry) i don't give a whit about "security concerns from running older versions of the os".
boots in 5 seconds flat from the time the apple appears to the finder from an older intel ssd. that's good enough for me!
I only have one computer capable of running SL, and that's running Lion at the moment. Heck, that computer has been off and unused for about year anyways, so I'd say its not even something that is on my radar.