I drive a company car with a full service history, serviced on the dot at huge expense, it rarely doesn't have an issue or two with it.
Service history means nothing imho. The last bike I bought with a service history needed loads of work doing to it. They ripped the guy off for a load of new parts (brake calipers all round, on a 27,000 mile bike???) and it surged like an absolute bastard. I got the bike really cheap and new what I was getting into when I bought it.
My 1150GS I bought with 44k on the clock and rode like a diamond, home mechanic serviced.
If it looks right, is priced right and rides well, then it'll be fine.