Please do I’m looking for one for when I’ll be short on time
I've used a rotary a few times but takes more time and also consider you'll need to wash all that white powder off your head when you're done. My advise to you is when you're short on time, just skip the shave until you have time to shave properly. If you really want a quick shave, you'd be better off shaving with the grain with a razor. Takes maybe a minute or two. Shaving against the grain is more time consuming but I find that people don't notice the difference anyway. My rotary tends to leave a few continents on my scalp but seems like I'm the only one that noticed that aspect.
I do have dry skin so maybe that has something to do with it. Me and rotaries just don't get along.