I have used Walmart's send out service. I have no complaints, except I rather not wait 7-14 days. I've had sloppy care of the negatives with 1hr photo service at Walmart. Maybe it's about the lack of care by poorly trained staff, or just because I didn't want prints. I would rather pay a bit more and drive 23 miles to a pro lab, than wait for processing. Sometimes, I can call ahead to schedule E-6 processing, while I wait. I appreciate the tender loving care of my film.
I want to help the pro lab stay in business. I'd be devistated, and stuck with a freezer of film, if they went out of business. Imagine: a cellar full of wine and you can't drink it anymore. I can't imagine left with only digital. I don't have a place to set up a wet lab.