I'm studying Revs this year as a Year 11 student, and since we've only just finished France, my opinion is probably not worth as much as those who've completed the subject already - nevertheless, I think that if you enjoyed history this year, then go ahead and do Revs next year.
Maybe it's because we did the unit 1 for History in Year 10, but I didn't find the learning curve to be too steep. Like you, we did the Russian Revolution last year, and my teacher also encouraged me to continue onto Revs. Going by the results of my first SAC and the practice questions I've done, I don't think I could do much better if I had waited another year. I don't have to spend much time studying it - I spend a few hours at most on practice questions, I do some extra reading before bed and on the way to/from school, and I usually review my notes or read through my textbook in class. I guess how much time you put into it is up to you, but I personally don't think it's incredibly demanding for a 3/4. The sheer amount of knowledge you need to memorise (and not only memorise, but understand, evaluate, analyse and all sorts of other twisted and evil things) can get overwhelming though, but it's not too bad.
Best of luck to you if you decide to do it next year. (: If you're going to do a 3/4 in Year 11, it may as well be Revs.