I bought the Kombi Assynt units direct from The PlyGuys, but ending up selling it on to another forum member as the wife didn't like sitting on the benches and wanted a "proper" car seat in the back. They're very well finished and solidly built, only downside is that even for someone short like myself there's not much headroom if you don't have a poptop.
I have these now and really like the versatility. I can carry items 3.2m long between them, I can carry 8 x 4 sheets without removing them with the rear seats folded down (but cover the back or the rear seats). I can not sit on them but are getting swivel front seats next week so sitting is resolved. My top loading fridge fits nicely between them when in camping mode. Loads of storage which can be configured how you want it. All in all very good quality. Also, next week I am having a single removable rear seat fitted so I can carry 6 (fronts are both captains rather then 2 + 1). When in 6 seat mode I will remove one of the units therefore camping I can’t do in that mode. I do however, still have significant storage with the other unit in place. Easy to fit and easy to remove but you will need 2 people to lift them out. For me these were the best option for switching between, work van, football team transport, day van and even week long camping.