pro:
If you buy a brandynew shee, and keep it clean/lubed and run alot of oil in your gas, a shee will run forever, get some pipes and a filter and your set....my lil brothers friends shee has been run at 28:1 with yamalube since the day it was new in 91 stock bore, rings, pistons....never even had the head off. and its been through some hell too, rides the piss out of it to this day. 13 years, not bad at all. there was guys getting 15k miles on rz350's around here including some track time.
con:
$9200 air-vac ride