I was calling people from Shapton to see if they had any CDN distributors and to inquire about the 15k Pro Series Stones. Started chatting with the rep, told him why I needed the stone and he told me that their Glass Series 16000 grit stone would perform better on razors than their 15000 grit Pro Series. I don't see why he would recommend a cheaper stone as a better performer unless he is truly convinced in it, but I wanted to see if his belief is correct.. Therefore I have a couple of questions:

1) Has anyone here used both of them or at least just the Glass Series 16k stone and what were the results? How do they compare?
2) What is the maintenance for these stones? Do I just lap them with some wet/dry sand-paper on a glass plate?

By the way if noone here has tried it yet, I wouldn't mind being the guinea pig, but if the guy is absolutely wrong, I'd like to know before I place the order.