Good try, ScanCafe, but... not quite

When my father passed away, my stepmother sent me six boxes full of 35mm slides. The majority of the photos were from my childhood, and while not all have significant sentimental value, I figured it would be nice to look through them.
First, I went on eBay and purchased a used slide projector. Great idea. It was inexpensive, arrived in just a few days, and it worked quite well. But a few impediments quickly became apparent. Number one, I don't have a projection screen. Two, setting up a projector, hanging a sheet (that was the quickest solution), darkening the room and then getting the presentation going took a long time. Third, the kids just didn't want to sit through the lengthy process of going through a bunch of slides one at a time at my pace. Finally, even I didn't enjoy needing to go through dozens of slides to find the one or two I really liked.
So next, I read up on ways to get slides scanned. Scanning them myself was quickly ruled out. I would have to buy special scanning equipment, and it became apparent from my online research that quality could be an issue. Most important, I simply don't have time to babysit a slide scanner and do the necessary edits and adjustments. Offshore scanning services were the way to go, and a few companies seemed like they had consistently good reviews, with one of them -- ScanCafe -- standing out as the clear best value.
The ScanCafe website makes it very easy to set up your order and even creates a mailing label for you. When you create the order, you tell them how many slides you think you have (I had nearly 5,000), how many slide trays they are in (for me, it was around 25), and then they calculate an estimated cost. After you enter some info and they bill your credit card for 1/2 of the estimated price, the mailing label can be printed and you're good to go.