I considered one of those, but in the end I bought an Expedition Bagman--mostly because I thought the Karrimor copy would raise the bag high enough to complicate throwing a leg over the bike. (It also obviously raises the center of gravity somewhat, though doubt that it makes any practical difference.) I'm happy with the Bagman. Even though it allows the bag to hang relatively low, its presence still has to be taken into account when mounting and dismounting. I imagine it would be worse if the bag rode higher.