Hi
Ive never heard or tried Krampera gear, but I vaguely remember a review in BGM a year or so ago. If you are referring to the B1B cab at £894, then it seems rather expensive and heavy for what it is. I'm sure you can save money and get a lighter and possibly better 15" cab elsewhere. You could even get a high quality 2x15 which weighs much less for that same money, and is a similar size.
Like I said though, I've never heard or used one so the 'possibily better' bit may not be true...
Cheers
Geoff