I live in Baltimore and these things have been awesome. Over the summer and early fall, I used them a lot for trips that were between 3-15 blocks. They were usually less than half the price of a Lyft, were fun to drive, don't directly use fossil fuels and were usually available (in one app or the other) within a block or two of my house. I used them to meet friends for brunch, to pick up my car from getting worked on, to go to bars near my house and to go vote in November.

Now that it's gotten colder, I think my range for using them will contract to something like 2-8 blocks, but I don't think I'll cut off using them entirely. I don't notice them being "piled up" anywhere (except for at a street festival, but lots of people were picking them up too), and I don't think I've ever run into a situation where my path was actively blocked by one.

Baltimore used to have a bike share, but I've heard it's being shut down and even when it was up they had a hard time keeping bikes in all the stalls.