I understand the point about not needing faster operating speeds for music, but anything without moving parts ought to reduce vibrations, and maybe heat, both good results in any hifi setting. I'm close to needing more space on my B2 and will definitely try a SSD.
No idea if this is relevant to the B2, but the HDD in my laptop died not long ago and was replaced with a SSD. I didn't notice any big difference in running programs, but it boots up so much faster and seems quieter.