2000 Tt600 Potential Problems!

Hi all, this is my first post so hope it's in the appropriate section.
Could anyone give me an overview of the 2000 TT600 engine reliability and any potential mechanical issues it may have, only asking as I would like to clarify whether it would be a good buy as I have read on 'other' forums an chat rooms it can have a problem with crankshaft oil seals and multiple oil leaks etc:
I am aware of the fueling issues but these can be sorted relatively easily with a good re-map and the reg/rec can be sorted with an upgrade.
Everything else I have read about them seems to be positive it's literally just the power plant I would like clarified as a good unit or is it just waiting to go wrong due to potentially poor design.
If there's a re-occurring pattern with multiple bikes it would be good to know what to look out for.
Hope someone can help with this.
Many thanks in advance.