Purchased IWalk 3.0, arrived very quickly and straightforward to assemble. Used the youtube video and just assembled along with video. Used initially with a cast and made the required adjustments for height, foot inclination. Used for 10 mins on first day while getting used to it, but really very straightforward. Have now changed into Vacoped boot which has a valve at front, but a folded towel under my knee and adjustment to the straps and ready to go again. I asked my consultant about it and he said that it was fine. Rather expensive, they are cheaper in the US where they come from but I'm glad I bought mine for the added indepence gained. Excellent communication from Peglegs whenever I contacted them.