The BSRJ was Ken's first attempt at a less bling and J bass version of his US-made basses. They are very well made, as are all of Ken's US basses, have a good core tone and maintain the Smith reputation. They don't sound like his basses that have the soapbars in them, but you wouldn't expect them too.
As to a price, personally, given their bolt on nature and simpler woods etc, I would say something less than £2k tops for a mint condition one.
Hope that helps
Gareth