I used to use a heavy pedal steel slide. It was very smooth, but the weight made it a little difficult to use.
However, the weight helped with the intonation quite a bit. I have no idea what happened to it, haven't seen it in years. Might have I lost it when I moved a decade ago.
I had a similar thing happen with a band. The bass player was incredible, had toured with Prince. Super nice guy, too. We had a killer rhythm section, the drummer was a session player I used to hire.
Anyway, we're playing a song, and I'm on keys next to him. The bass player looks over at me, gives me a wink, plays an incredible bass line on the fretboard with his left hand, while walking over to a shot glass on top of his amp, and with his right hand reaches for the glass and drains it while not missing a perfectly timed note.
Then he looks back at me, gives me another wink, and gets his right hand back on the bass. I laughed so hard I almost couldn't play.