Highlight of my 3 day stay in Boulder. Can't recommend it enough. It was 90 degrees, hot, sunny. Did the 1030am tour. We had a big group, maybe 10 people, and they had 2 tour guides, one leading, and one at the end to make sure everyone was ok. My seat came loose during the ride and he fixed it right up, no issues.
Thankfully they give you as much sunscreen as you need, plus water and some snacks. There is a little carrying pack on the handlebars so if you bring your stuff, it may fit in there, but recommend traveling light if you can. There are plenty of rest breaks for you to slug water, eat, put on more sunscreen, etc. The e-bikes are so much fun, and that ride up to NCAR and then back down was super fun, so much that I drove back up in my car the next day to see it again. Our group definitely skewed to the more older age (I'm 49), and everyone did just fine on the e-bikes.
You might just fall in love with the e-bike, just warning you.