Hello, I do not have any reviews for you but I have been doing a bit of glass etching in HF lately. I am doing about a 140 um etch in 49% HF. I have not seen much difference in etch rates between different borosilcates. Soda lime was mess...hard to even find my glass through all the deposites. I have used both amorphous silicon (7500A with PEVCD) and Gold (5000A with 100A Cr). I think the amorphous silicon held up a bit better but the jury is still out. In either case, make sure your substrate is extremely clean. Let me know if you find any good reviews, Dwayne