Valk 4 M
The Valk 4 M is a very popular 4x4. It has been used by many great speedcubers to set many 4x4 records. If you are looking for a top level 4x4, then this is the perfect cube for you.
The inner pieces falls out when I turn it fast - so I would have expected better quality for the price that I have paid. So in general not satisfied