Go on then, I'll wade in.
I currently drive a SWB T5 with an Angel camper conversion from Amdro:
I did the conversion myself using the kit, but they will do the full lot for you.
Myself and the little lady lived in it on a European road trip lasting from April to September, from Norway to Southern Romania, the year before last. We did have a small awning too, but didn't always put it up.
The kit performed flawlessly, and a massive advantage is a fixed boot area, which you often don't get with rock'n'roll style beds. It held two road bikes, two deckchairs, an awning, a BBQ, charcoal and other random bits of stuff that accumulated over the months. For me it was a key selling point.
It's right that you should think of it as a mobile tent, rather than a mobile home: you can't stand up and walk around in it, but find a more stormproof tent It's completely waterproof and windproof, you don't need to pack it away wet, with a two ring stove, running water, a stereo, a heater (if you fit hookup) and a comfy bed. It is also very comfortable to sit in reading or whatever when the rain's bouncing down outside. And you will spend time outside of it when the weather's good, but that's kind of the point of camping isn't it?
I now use it as my daily commuter and get about 38mpg. It also fits in standard parking spaces, multi-storey car-parks and costs the same as a normal car on ferries.
If you're anywhere near Cirencester you're welcome to come round and I'll give you a tour