I’m being overly cautious to be honest. I know that once we get into our rhythm, learn and become confident with our set up the 907’s will be left at home and we’ll enjoy using the cupboard as storage space. We have just sold a VW California and have a couple of 907’s knocking around that need to be used, or not. Another thought was 907’s are more easily found in Europe and therefore we’d not have the hassle of switching between other suppliers bottles.