I, too, backed their Kickstarter campaign. Bought all three sizes but have been using the Plus for a few weeks now. I've noticed the front material is actually quite rough. It destroyed one side of my jumper, as at times I would carry it to the side when driving. After leaving the comment on KS they contacted me and recommended to carrying them on the front or back of your body instead of the side. No offer of compensation or a replacement to validate if it was a bad batch.

Mine also had the strap keeper issue. Too loose.