I have bumgenius too! I've used them on my eldest until he was 1 3/4, then it started leaking, probably because he's a heavy wetter. Getting some cotton inserts could have solved the problem, but I just couldn't be bothered, as I planned to toilet train my son soon. It turned out that he wasn't trained until he was over 2........
I find it very easy to wash.... Just pop them in the wash and since they're microfibre and dries really quickly. In fact, I used them on my No. 2 the other day and they're mostly dried in a day, even in these foul weather.
My no.2 is just over a month old now. I tried her on the bumgenius when she was 2 weeks old but it was way too big and leaked around the legs. I tried them on her yesterday and it seems to be doing ok. I recently relocated to HK so I'm a bit worried whether cloth nappies are OK in HK's hot and humid summer.....
Sweetiepop, I just bring a wet bag to carry the dirty nappies home to wash.