your first bit of homework is to read the sticky "index" thread at the top of this forum.. and to answer your question more specifically, there are several known issues/weak points with the first generation 950's (although a few were addressed between 2004 and 2005 model year), but with that kind of mileage, the known issues are minor in comparison to what it may take to do a rebuild.. which is not a big project, unless your tight on money and/or skills necessary to tackle an engine rebuild. just an opinion
"ride hard, live righteously"
'04 1150 GS "Ich bin ein Berliner"
'12 KTM 690 - Austrian Ferrari