I got a chance to see one of the satellite trains shortly after launch, when they had barely had a chance to spread out. It looked like a continuous line of light slowly moving across a section of the sky; really an amazing sight.

Unfortunately I live in an area with a decent amount of light pollution, and haven't been able to catch a glimpse of any of the more recent trains. (Might have something to do with the dark coating they're putting on the newer satellites to reduce reflectivity.)

For those who want to give it a try, this site gives a list of optimal viewing times, complete with an animation of where and when the satellites will appear in the sky at your location: https://james.darpinian.com/satellites/?special=starlink