I use the Shapton Cermic Pro stones. I've found that the 1k is qute a slow bevel setter although it does give very good feedback. I now always use it with slurry. I generally do 100 or so laps using x strokes to set a bevel on it. I coud probably get away with less laps but as setting a good bevel is key to a good edge then I don't mind. I found that adding a 2k after the 1k improved my edges
I had both the 16k and 30k glass backed stones for a while. I found the 30k was not rally good value for money. For the price, there wasn't a large improvement of the 16k. In the end, I sold both the 16k and 30k as I peferred the finish from a natural stone.
"Yes, Madam, I am drunk, and you are ugly. But in the morning, I will be sober and you will still be ugly."
Sir Winston Churchill