I got my first Fender J when I was 11 and had no idea that the model they pulled off the wall for me was a fretless until I had it in my hand. The sales guy asked me, "can you play fretless" and I, being a super-cool preteen, just shook him off and said, "yeah it's no big deal". And thus, I started playing fretless from pretty much day 1 of my bass career. My personal fretless J has seen a lot of modifications: new tuning heads, Fender Custom Shop Vintage Noiseless pickups, a Leo Quann Badass II Bridge upgrade, and a wiring harness upgrade. I love the way it plays; on its own it's very synth-y but through my board it can definitely get mean, especially since I play it with DR Fat Beam roundwounds. I'll never part with mine.