Hi
@Jonny, sorry for the delay in responding, absolutely flat out with work and not being keeping abreast of the Forum - I know I need to get my priorities straight.
Anyway, I think most others have actually answered for me. I have B14's as that was what was available, not aware that there are B16's for the transporter. Sounds as though from what you describe they are 'top adjustable' so there is an adjuster somewhere on the shock that you can soften/ harden the rebound, preload, compression settings but then you are getting race car territory. I wasn't after that for the van, I just wanted a ride that was as close as I could get a van to being the A6avant black edition that I sold to get the van, without spending crazy money. Yes £1100 is a lot, but I honestly think it was worth every penny.
Good luck in whatever decision you make, and so long as you have researched it, and it is right for you then whether or not you go for the B14's or something else, it's about setting your van for what you want.