Buying a Bugaboo Donkey used - what to look for.

[Rapscallions]

Hi all, having used a Chameleon for the last year, we now need a 2 seater. The obvious choice is the Donkey after having and loving the Chameleon for the last year.
We have seen a few on Gumtree and Ebay and intend to go and look at some over the next week. What faults have you come across and what would you look for when buying one.

Also ,what accessories does a twin come with as standard so we can check that the ones we are looking at are 'complete'?