I do 10 zones (about to be 11) withjust the elk and i love it...
I don't a slick UI for changing durations/start times from my touchscreen yet... But the capability is there - for me, just pending my decision to build my own, see if i can plug into linuxmce or buy cqc...
For now, i open ElkRP when it starts getting hotter to change the rules... The Rule space used for this isn't that bad either...
thx
-brad