Depends what you're after, thick warm beefy passive PJ, or modern sizzling active J! I love my BB1025X and doubt I could ever replace it with any J-type bass (but I have not tried the Sire!). Maybe it's just me but I only ever like the sound of Jazz basses with both pickups on full, either pickup soloed sounds weak to me, whereas the BB has two great usable sounds in it (not counting the bridge soloed as I hate that sound too, on any bass!). I prefer a flatter fretboard like the Yamaha, the curvy 7.25" radius of the Sire is one of the things that puts me off trying one out.