I have an original and love it and used it lots!! I didn't like it with a newborn as found it fiddley to use with insert, but from 4 months on I used it all the time, have back carried boys even DS1 who is now 15kg without an issue (apart from I am to unco to get him) on my back myself!!)

For a new born I loved close carrier which I used from birth till 9 months before I found it to sore on neck.