Are you talking about the portable ones for inflating tires away from home after a flat?
I’ve used one, I had a flat and was reaching for my co2 cartridge when someone handed over their pump instead. It seemed to work fine, and I liked that they could set the target pressure. I would use a floor pump or air compressor at home, though.
My newest bike (which I bought used) came with an SMP Dynamic saddle. I ended up swapping it with the saddle on my previous bike for fit reasons, but when I do use it, I find it’s pretty comfortable.