Well, I wish I had got one when my first baby came along, I breastfed him for over a year and dd was breastfed for slightly longer, around 15 months.
I think I would have used it more with our first baby, as you tend to spend more time just sitting feeding, because you can .
2nd time around, ime, you don't get so much time, although still good for night time feeds.
The only reason we didn't get one was because I couldn't justify the cost to myself, as had stopped work when first baby came along.
Sorry for the long bla de bla..........
My advice - get one if you can afford it! and get the best you can afford, try them all out if you can, John Lewis stock them and mothercare have them in their mum & baby rooms.