I have used pocket diapers, my husband likes them, but I prefer flats and covers. They wash up much better, last longer, leak less and you avoid the stink of microfiber. I have not tried those exact diapers, but would assume the inserts are thin, requiring more then one per change.
As long as you don't mind washing most days, you really only need 12 diapers and 3 covers. The large flats and one size covers fit my baby well by 6 weeks, before that they fit but were a little bulky. They will last until potty training. You can use disposables until then, if cost is your reason for cloth. I prefer to avoid all disposables, so I went with 18 newborn prefolds and 6 small covers, which was plenty. The newborn prefolds also make great overnight doublers with the flats when baby is older. I bought new, organic and still spent less then $200. They have also lasted through multiple kids.