I have a Valco Trimode twin runabout and dont mind it, I like the concept of having babies side by side too. I dont like the P&T for the same reason as you. I am not keen on the toddler seats on 3 wheelers either because I am worried about how steady it will be with my overactive toddler.
When Liam is a bit older I will probably get a sdie by side stroller for out and about and just keep my Valco for walking.