Hi. I used them exclusively for my daughter until she was about 6 months, apart from when travelling or out for the whole day, and then mixed them with disposables. Now she is over one i tend just to use the terries for night time.
I ordered them from the UK. I would type in the website address i ordered them from but this would probably get deleted. Do a search for the nappy lady - a UK site - website URL is how it sounds. They have a good comparison on the site of different brands and they assign you an advisor to help with ordering etc.
I wasn't too impressed with the all in ones and ended up with separate terry and cover. They both were either velcro (works just like disposables to open and close) or snaps. Very easy. I put them all in a sealed plastic bin and chucked them in the washer over night. When they are still on breast/bottle you don't need to even rinse the poo - won't get too graphic here! I was a bit skeptical when told this but it's true, cleans just as well.
It takes a little adjusting to get used to, but after that it's pretty straightforward really. In terms of numbers I had 15 terry nappies and 4 of the breathable plastic wraps for 0-6 months in the first size, and this was enough to have a full load of laundry with a few spare to use while the laundry was on.