I have one of these rather heavy basses - but I love her so much. MD7. Her booty is wide - and she feels good
Seriously... When I play my 7-string smith on a gig - I generally split my time between standing and sitting. It is much easier to peform sitting, but sometimes I have to stand - especially for some solos - but other solos, I will sit.
I have no hard fast rules about it - I just do what I think will make the song happen.
I do tend to enjoy my ken smith sitting however - I guess father time is catching up with me
. I think that most players get better performances sitting also - because the bass is balancing on you leg - and your fret hand is free ( or more free) to focus on just playing the intruments, vice balancing it.
The heavy cocobolo does produce a very unique sound - other smiths do not have that type of tone - is it better? debatable - but different - yes.
Other times however, I do prefer a light weight bass. Especially long gigs - so I have other basses for those gigs.
ok.. thats my two cents...