Elektron Musical Instruments

Hi,

I'm thinking seriously about getting a Machinedrum, but cannot afford 
to buy one new. Are there any areas that need to be looked at in 
particular when buying one used ? For example, is the o/s upgradeable 
by midi or eprom ? Are there any particularly parts that can go 
dodgy ? That type of thing.

Unfortunatley i dont know anyone with one, & being in Ireland if i'm 
buying one it will typically be from the UK, so i won't be able to 
see it beforehand, so i'd like to know what questions to ask before 
paying over.

Thanks.