We used to have DS in the middle, but as he started getting heavier we moved him to the passenger side away from the oncoming traffic. I have fitted the capsule for the next bub in the middle, as I figure its safer, and that way we can still give someone a lift in the back seat. We wouldn't be able to have an adult sit in the back (without difficulty getting in and out!) if the seats were on opposite sides to each other.
I was worried that DS would be able to reach bubs and annoy him/her - but it seems when he is strapped in he wont be able to reach bubs face at all - and we figure bubs will benefit from being able to look at DS and visa versa.

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