Jim, who is I believe the owner, was great to work with. I used PrintablePress.com, so brought in PDF images to be printed. He was very responsive to our calls and really knew what he was talking about-- letter sizes, postage costs, paper weight, etc. all off the top of his head. He also had binders with more traditional invites in the office, so they may order invites as well as just print them. He was very reasonably priced and the turn-around time was 1 week (for digitally printed invitations). When we got the invites home, we realized that they had printed us extras that they didn't charge us for-- very considerate!
Working with Jim was very stress-free and I would recommend Knowles Printing to anyone.