We used prefolds exclusively since DD was born (well, we briefly used gdiapers before giving up and just using the covers w/ prefolds
), and they worked well for us. Then, dd needed to go up to the 15-30 lb size, so we went to our local diaper shop and bought those...and one BumGenius to try out...and now I hate them.
They're really not that bad - but dd is super squirmy so it's hard to get everything situated. We have since bought FuzziBuns and use the prefolds when my pocket diapers are dirty.