No I haven't - I don't think I've ever seen someone have one in their back garden! It's quite popular here for big parties and weddings to hire a professional to do a hog roast and the meat then is yummy.
Yes, we had a battery powered one for the BBQ. It just sat over the grill.
Rotisseried meat of any type is just delicious. I don't know if BBQ's Galore still sell them.
Even Rotisseried meat in oven is great!