They seem a pretty popular choice, and alot of mothers who deceide to breastfeed for a longer period really rave about them because they can feed when on the move (i never managed that,,although to be honest i didnt breastfeed for long).
They are alot of manufacturers of them and i wondered which was the best, not that i am thinking of expanding my product range yet (you never know) but would be interested in knowing your feedback.