I have never heard of anything like this.
Do you think you'll really be caught out so badly that you'll have (a) nowhere to lay a baby down on a changing mat at ground level to do a quick change or (b) baby change facilities nearby?
Be interested to see what it looks like but honestly think it sounds like a gimick.
Ahhh...just Googled it. Safer looking than I thought but, again, really necessary?
BabyDeck Stroller