My worst buy has got to be Imse Vimse... totally awkward to put on a wriggly baby. although I did use them once or twice when she was about 10 weeks old...they are now at the bottom of the pile and I have no idea of how to shift them at all!!!
I have been really luck with my cloth I usually buy what others recomend, the only nappy that I havent got on with was an Itti Bitti D'lish, I just didnt like it and I was able to sell it on fairly quickly as they are pretty much in demand. I stick mainly to the bigger brands ( bg, totsbots, swaddlebees etc) that have a proven track record .