Buying a Sportrak

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Hi All,
Looking into buying a sportrak,prob something for around
the £2000 mark.
Is there anything in particular to look out for
when buying one,anything thats prone to wear,or any model
that is bad etc etc Unknw
Also servicing of it..are they easy enough to get serviced
and obtain parts for Unknw
any advice would be much appreciated Smile

thanks

J