Chainsaw Repair

sorry to revive this topic after so long and not sure if i should have posted in another forum or not. im going tomorrow to look at a stihl 066 magnum, a bigger saw than my rancher 61, and wasnt sure what i should look for. the guy said it has less than 2 hours on it since a stihl dealer installed a oem pistin, cylinder, and tank housing on it. he wants 550 for it with a 32 inch bar. it has the poly flywheel which means a late 90s early 2000 s saw im guessing. is there anything i should watch for in particular when i am looking at this? and is this a decent price?

thanks in advance for the replies