I've been rocking my Thumb BO for 12 years.
Had to replace the plastic JAN a few years back and am actually quite happy with it.
The frets are a little flat and comparing it to modern Wicks,...it seems they have a nice round crown to them,...which (I could be wrong) would provide a livelier tone. I'm considering having my bass refretted.
I need to breath some life into it and have some maintenance done to it as it's seen about 3 years of hard rehearsing and weekend warrioring,...but I'm so attached to it that I'd never get rid of it. It's seen me through thick and thin. It's been in and out of pawnshops when I had no money for gas (obviously always gotten out of pawn), no job,...no will to live. It's with me through the happiest years of my life (only getting better), my wife refused to let me offer it in trade for a newer bass.
It may not be something that any of my peers would chose to play (seriously seems like most people that would be considered part of my clique are into old Ps and Js and Rickys, but none of that matters to me),...but I love it anyway.