OK, finally I received it today.
Just swapped my aluminium Tiger case with this transparent one (aluminium kit is out for sale).
I have to say, its really nice combo. Sound is amazing, plastic case makes it sound a lot deeper than alu case.
I dont hear any kinda hollow sound that all alu cases make.
I bought myself two cases - purple and smoked black. Both look great.
The only thing that I could call as a really minor con, is the weight of it. It is light keyboard. If you are looking for a heavy one, like Rama U80, or Norbaforce case, this is not it:)
Compared to NK87 - I would go for Tiger Lite, hands down, quality is amazing, 100% no issues like I had with NK87.
Plus this mounting method, it is soooo soft and bouncy, perfect example of leaf mount. Highly recommended.