Hi i have the Large Base camp KK
I love the thing, It lives in the car, literally.
I cant tell you how many times its been used, either on the side of a road in a car park, wherever there are enough twigs
It's the best water boiler I've tried, it boils the same amount of water as my kettle in the kitchen in exactly the same time (Once its filled with dry wood and birch bark)
I have the pan and top cooker attachment and I've cooked all sorts or rather tried to.
As a water boiler there's nothing much better out there, To cook food that doesn't require water it's not that good, although the hobo stove attachment does make it better, its still only ranks as "it will do in a pinch" but remember its primary role is to boil water and it excels at it, everything else is just a bonus really.
If your after only boiling up a single brew I'd recommend staying away from the Ghille Kettle and the Kelly Kettle, while they are small they are bulky and have spouts and handles that sick out, the
MKettle is nice, sleek and compact, but only boils about 500ml
Here is a link to it.
http://www.thebushcraftstore.co.uk/mkettle-sas-ultra-light---hard-anodised-variant-7967-p.asp
Its to small for my needs, but my brother has one and its perfect for him