We got one last year ... in fact dh started a business converting VW vans into campers last year!
We love ours. We first took it on our fortnight's holiday in Cornwall, but also took our tent. It was fantastic for taking somewhere with a view, getting out the table, having something to eat or a cuppa and playing cards. We could go out for the day and just stop somewhere on the way back that took our fancy and eat, rather than trying to find a pub, or wait to get back to the campsite. And of course it was great for changing in after surfing.
But it has completely transformed weekend camping. We leave it ready packed with everything we need, including tins of food etc, so all we have to do if we decide to go away is throw a change of clothes in a bag and off we go. When we arrive we park and .... well, open the wine! It's very cosy and if it's windy or raining you don't hear a thing so you get a better night's sleep too.
Oh and then it gets used if we visit friends for parties and there aren't enough beds - we just sleep in the van. And even now in winter we use it, we'll go out for a walk somewhere then cook some bacon sarnies and have a cuppa.
And we decorated it for dsd's birthday, gave her and her friends drinks and drove them round her home town as if it were a limo! She said she was embarrassed but secretly I think she thought it was cool .
We have a VW T4. Dh and I sleep on the double bed, dd fits in the boot space and dsd goes above the passenger seats. We have a two ring burner and sink, and a small beer fridge that we can fit butter, a pint of milk and a pack of bacon in.