Yep, I've used Hugin (and obviously the associated PanoTools) a fair bit. It can take a bit of effort to get a decent shot, but some can look quite good.
I like this shot of Lambeth Bridge.
The Thames is good for this sort of thing. I've got one somewhere, that was taken a few minutes later on, from the south side looking towards Parliament. It took me a while to realise that the same couple was visible on both "sides" of the picture. Walking towards me on the left, and walking away on the right!
This shot of Ilfracombe would have been better, if some of the originals weren't blurred, but I didn't put it together until after I had left.