Agreed, it's a fantastic preamp. I'm a happy owner of a stock F360. Would you care to comment on the improvements the Jupiter caps and Z-foil resistors made? I've definitely contemplated some upgrades, but have a hard time choosing from all the options. Caps would definitely be on the list, and while I do love the sound of Jupiter copper foils, I've also enjoyed the V-Cap ODAM and Miflex copper foils I've had in different components too. Can't go wrong with any of them, IMO, but they do bring different strengths to the table.
GLWS!