Those full-body scanners that got fast-tracked into use by the Transportation Security Administration in the wake of the underpants bomber of last holiday season don’t seem to be upsetting passengers quite as much as anticipated. This is likely good news for road warriors and traveling execs who’ll be getting scanned more often than most citizen travelers.

The TSA anticipated that travelers would be squeamish about agents doing these full body scans, but it seems that after scanning about 4 million passengers with the 80 machines now in use at U.S. airports, only about 600 of those scanned are griping about the experience.

The big reservations: modesty and radiation exposure. Both these worries, however, seem to be fading into the background as travelers become accustomed to the new scanners.

Still, nobody at the TSA seems to want to rock the public’s boat, so the word is that being scanned won’t be mandatory even when the technology’s widely deployed. Airline passengers will always get the option of a hands-on, pat-down instead.

If you really want to kill some time in the airport, there’s always that option. Otherwise, it doesn’t seem as if getting a full-body scan is annoying enough to prompt too much protest.

By the end of the year, it’s expected that about 450 body scanners will be in use in the nation’s airports.