It's another tool in the tool chest. I wouldn't want to only have a fretless guitar, and I probably wouldn't primarily play one if I did, but I wouldn't mind having one in the collection to pull out from time to time. I play fretted and fretless bass, certain songs suit each type better. Getting proper intonation is definitely a challenge on fretless, and my bass even has fret lines. You have to be right on the money instead of having quite a large target on fretted instruments.