It was easy to downgrade it :)
Just flash it with 4,3. Then boot into recovery and delete user data + cache :)
Switched recently from Runnymede to MIUI. And I am really loving it. First thought I can't live without Sense. But actually I am not missing it at all.
I have the same experience.
My phone was really slow and it lagged, i tried 2-3 different S...