I've personally only used SSHFS (years ago). It was ok - slightly flakey for me. I can't remember what was wonky, but it was like 98% working, I couldn't figure out the last bit, so I just switched to straight up SMB/samba (I had pretty free control of the remote end, so that was a reasonable solution).
Same in my experience, but SFTP itself isn't exactly great either. Especially when your connection is less than ideal and you're working with large-ish files.
SMB tunneled over SSH works better in many cases, but of course that has it's own set of problems and is a huge pain to set up.
