I think Lion is very, very buggy. Apple should be ashamed of the quality of Lion. This reminds me of Vista when it was first released. Lion is a far cry from the stability and speed of SL.
Perhaps the cost of Lion inspired them to release a beta type product but that is unfair to their users. I -like many others- use my MBP for my job. I depend on my MBP for many tasks. Lion has many bugs that slows that ability down.
I find it impossible to believe that QA signed off on Lion without noticing any of the bugs that I have found from day-to-day usage. I think they became sloppy, resources went to iOS, and they felt they will fix problems with updates.
SL seemed much more snappy and responsive than Lion...perhaps I should say SL is more snappy and responsive than Lion.
Waiting to be modded down in 3...2...1
-P