Yes, I have a set now. Great drills. I just need to pick up the pace a little. Hard as porcelain, hundreds of holes to drill equals lots of time. I keep reading how quick the marcrist are so I thought it was time to upgrade.
I was using a sigma 60mm core drill bit today and it was unreal on 30mm marble!
I was using it alone to cut out shower valves from slabs, very quick and sharp.
The sigma look a bit like the marcrist.
We were using the sigma with no water, eating through 30mm marble with ease and no heating up. It was good and thick too!
We had 4 grinder/ polishers in action and dust everywhere, lol.