There's a site called www.bitterwaitress.com

It has stories of waiters, waitresses, store clerks and the others who've met or served celebraties and they tell about how the celebs treated them and whether they tipped...things like that

I haven't read through the whole site but the stories about Tom Cruise that I have seen all seem to say he's genuinely a nice guy(Katie too)...good tipper also

Speaking as someone who in my past worked a job where I depended on tips to survive that means a heck of a lot more than whether he acted the fool bouncing around on Oprah's couch for a few minutes

BTW There were some celebs that I personally have always liked who according to story after story on that site seem to be kind of jerks

Oh in case you get lost on the site the stories about movie stars are here

http://www.bitterwaitress.com/gossip/articles.html?category_id=3