I am a busy working mom trying to cloth diaper.  Have a little 7 month old boy that nurses all night and of course makes an equal amount of huge pee diapers.  We were having trouble with him soaking through everything.  Had tried a million combinations of BG free times, Flip system, BG pocket stuffed, Fuzzi bunz stuffed, Thirsties, prefolds, covered with Flip stay dri, fleece outers, etc...Now we have added what we affectionately named "Woolie" (the Disana merino) cover to the mix.  I was scared of the extra work of wool but people are right it is actually easier b/c you only have to wash it a couple times of month if you spot clean it.  (*once you get it properly lanolized).  We are using lanolin mixed with Eucalan to get it up to snuff.  Also we were afraid it would be itchy.  This wool is so soft and after you lanolize it, even softer.  I honestly had never had anything made of virgin wool before.  Amazing.  Really happy.  Saving our pennies to get a second one.  Super happy I got a slightly larger size b/c they fit like capris right now but will last him a long time.

***update
We are still using this single wool cover and it is the best diaper cover for overnight for a heavy wetter.  Hands down.  Nothing can beat wool.  We use a Bamboozle with a Flip Stay Dri under it and have had great success.  I have even added a wool bed liner to the mix.  Pee has never ever soaked through it to the mattress.  Wool is awesome.  Still using the Eucalan with Now Lanolin about once every 3 weeks.