I don't notice the weight difference at all.. Used a MB duo (the original so without the swivel front wheels) with my 2 for the last 2 years.. So DS was 1.5 and DD was 3 when I first got it.. No dramas with weight at all.. I have only noticed it getting heavy in the last month after not using it since the beginning of the year. (DD is over 5 now and DS is 3.5) and average weight for their ages..
ETA - shame you aren't in Brisbane.. I am reluctantly giving mine away.. (I got it off freecycle, so would feel guilty selling it, even though we spent a bit of money doing it up with new tyres etc).
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