I'm guessing no one has and now I understand why. Very small company in Italy that not many folks know about. Ovidio (owner) is custom building mine this week and I'll give a review once I have it and can spend some time playing on it.
As I've said before, I am new to the cajon after 30 + years as a drummer. I guess most guys just get used to the posture needed for these. I don't like the rock back technique since it makes it hard to use pedals. I've noticed that no one but Schlagwerk is making a stand to angle the drum that actually sits on the floor, and it doesn't give much of an angle. Looking forward to trying this one out.