Returned the F1 today. GC was very friendly. Asked if it worked okay but just wasn't right for me. I said yes.
It had a slight grit. I like a clear tone when I want one. I think it's the price point electronics. I have to watch myself on TB because I can impose what I think and value on another's descriptions of the sound of a piece of gear. " Warm mids fast response" may be bright treble and a Jaco burp to me if I were to hear that bassist in person on this piece of gear. I'm spoiled by pres that cost twice as much. For the F1's price I have to want to wake up in the middle of the night and play it.
It didn't call to me....."precious..."

Any way this all being said I've heard Brad get smooth great tone out of an MBII and his Nahas. Of course that's his basses and his touch. Last I looked I was me playing, getting my sonic.

Peace.
P.S. before you think I'm a gear snob. Immediatley after leaving GC, I played a gig in a bar in downtown Baltimore with two singer songwriters, a mandolin player and a harp player. All stellar singers and players. It was an art opening. Mackie PA a little of my line out in the PA. I was using an early now vintage maple neck G&L L1000 and an SWR LA-8 (modded with a BBII 8" Celestion). Outstanding gig, sound, and bass sound. One hand carry. I may spend more time with passive basses after this.