I have to say that I have dropped SD from my protection line-up

As much as I like the GUI and scanning, the memory usage was just too much for me! SD5.0 used over 200MB (including VM), SD4.x used 80MB (including VM). Now I'm using CounterSpy 2.5, guess how much memory?
..........................50MB (including VM).
Unless SD 5.0.5 reduces the memory usage significantly, I wont consider returning to it.