My doc recommended one as I approached 50, knowing that I like to ride and push myself fairly hard. The test itself was pretty much a non-event - get hooked up, jog on a treadmill for a bit. No worries, no stress.
For me the kicker was the next day, when my doc called me and said they'd found some abnormalities and I was to report to the hospital IMMEDIATELY. Spent two days getting tested before they determined that it was a false positive. Now THAT part was stressful!!
Good luck.
Steve Z