I really struggled to justify buying this case. It is very expensive, almost unjustifiably so. However I have to admit that it is a piece of design genius, allowing fast and easy landscape and portrait standing.
It works on magnets, no fiddling about. Some reviewers have commented that it adds considerably to the weight, but that is only because the kindle is so insanely light on it's own. The weight does not bother me, primarily because it pops in and out so easily. If I'm stationary and care about the weight, I'll just pop it out and pop it back in afterwards. It also seems to actually have a positive amplifying effect on the Kindle speakers, adding to it's overall usage.
To summarise, it's expensive, but if you can justify the cost I really think it's worth it.