We're not a huge shop - so it's impossible for me to have someone sit by the printer and watch for print quality. We put a digital camera above the print area of our printer and can watch it remotely over our network and the internet - I can even monitor it while I'm at the coffeeshop while it prints.
If you want to check it out here's a link:
http://signs.blogsite.org
I'll leave it up for a week or two. Primarily - I can see if it's printing and check for banding.
The camera we used: Labtec Webcam Pro - we got it at Amazon for about $25.
