I will say that the table's are amazingly light given their size, they are likewise delicate and require very special care or you can shatter one with great ease.
IF you are buying one, which really is the best way to go, Dirk will be more than happy to help you out but understand, he's a working pro with little time. . . he will respond but it may take him a week or even longer to get back to you. To him and others in his position, you're just another hobbiest wanting a piece of their time and mind. I don't mean that to sound cruel but it does get tiring, it's one of the reasons I tend to be short with people when I initially meet them. I just don't have the time or energy to invest and I'm a virtual no one on the scene, so consider what it's like for the guys that have a name and who are successful.