Thanks for indulging my obsession(s)! :)
notwaving, no, it's not heavy at all. 10kg, I think, but it's easy to carry, so doesn't feel heavy. I really like the fact that it all folds and packs back "into itself", so no space wasted.
For now, we've left it in the box it came with, but I'm thinking of making a canvas carry bag as that will save even more space. Technically I guess you don't really need a bag / box, as it's very easy to carry (it's got a handle thing you can carry it with), but being a wood burner, it'll soon be covered in soot, so I'd rather cover it with something during transport.
Hmm, let me think about negatives... Oh, you have to clean the flue sections every now and again. Apparently a cheap toilet brush would do, and would be easy enough to do as the sections take apart for storage anyway. The one night did nothing, but I'll keep an eye on after using it for a while.
Ease of use: Very. We had kindling available, and used some pine cones (always take some with to start fire with), so easy enough to get fire started. First log we put on was a bit damp, I think, as wouldn't burn properly. So we put some more cones on and smaller logs, which then worked fine. I think I need an axe though ( 
). Excitement about having potentially found a new essential item, I do think it will be useful when no kindling available. Actually, my waffling was unnecessary - light fire inside is really no different that starting one in the stove.
I can't really remember how long it stayed warm - didn't really look, to be honest. I think reviews mentioned 3 - 4 hours.
Some more pics here:
www.campingsolutions.co.uk/gallery/
Oh, and how to put it together:
Made me laugh - one of the discussions about ease of set-up said: If you can't set it up yourself, you probably shouldn't be using it!