I love BSA's.
Over the years I've had several other brands, but BSA suits me best.
My collection consists of (yes I think I am a bit of a show off haha ):
Superten .22 JB tuned
Ultra's: .22 ms JB tuned, .177 ms JB tuned, .22/.25 ss
Spitfire SF .177/.22/.25
Firebird SF .20/.22/.25
Techstar .22
Meteor Mk1 .22
Cadet Major .177
Improved Model D Light Model from 1926 .177
Standard no. 2 from 1924

My favourite is the Ultra. I can change calibers, barrel lengths, cylinder lengths, stocks and power settings (I have fac) within minutes. It is not only versatile, but also bomb proof and the mmc system works for me.
I don't have any post John Bowkett BSA's so I cannot comment on the current models.