I just had my super single Diamond installed last week and I hooked up the garbage disposal and plumbing today. It was a real WOW for me with the room in the 36" sink base. Coming from a large deep double SS sink with the two drain lines underneath and a garbage disposal, to a sink that tucks everything to the right side was interesting. My drain and my shutoff valves are over to the right also so I have a ton of useable space inside that cabinet.

I debated between the two myself for quite a while. The diamond was less expensive, I thought I would like having the drain to one side for function in the sink also (I thought i would tend to work in the middle and still have the ability to push junk to the right into the disposal. I haven't used it yet so don't know if this will prove true) and the ability to gain extra space underneath were the deciding points for me.

I tend to like things simple and symmetrical but the drain being off center doesn't seem to bother me visually. The sink is deep and it is way down there!

Thanks for the responses!

I know the Diamond sink comes with a single hole pre-drilled. Are the other holes easy to drill out for side-spray faucets, water filtration faucet, etc?

Any issues with undermounting?

I couldn't decide between the diamond and the precis until one day when I was chatting with the designer at my fabricators office. She said the more pronounced quilting on the bottom of the precis seemed to fit what she saw as the "pro" look of my kitchen and appliances. Since I didn't need to worry about room under the sink to squeeze in trash or lots of other supplies (other than a GD, cold water line filter, DW supplies, etc.), that was as good a reason as any for me at that point. Decision made. (Btw, I wasn't buying my sink from my fab.). This wasn't what you asked about, but thought I'd mention it as an addition to my answer to your last question.

As to your last question, my fabricator said that when undermounting the diamond they cut the faucet hole back flange off before install. Your faucet, soap dispenser, and air switches can then be located where you prefer.

They undermounted mine with no issue. Unlike breezygirls fabricator, they did not cut off the back flange.

I wondered how they were going to drill through the quartz and hit the existing silgranit hole exactly and then I discovered it didn't matter. They mounted the sink on the installed counter top, then they marked center with a piece of tape, then they drilled. They did not hit the pre-existing hole in the sink exactly and it really didn't matter, their drill is tough enough to go through granite or quartz so it had no issue going through the silgranit.

I chose only a single hole for my top but they asked if I had anything else I wanted to mount and I am guessing we would have chosen a location and their mighty drill would have plowed through both materials.

Just had our installed yesterday and I am in love. I thought the drain might look weird, too, but haven't found that it looks odd. I like the fact that you can have a large item on the right side, and still have plenty of room to drain on the other. Here is a terrible shot of ours:

I love my 1 3/4 single Silgranite II sink. I basically went with the single sink because it's deeper than the double.
Very easy to keep clean and I can hide a lot of dishes in there before I load them in the dishwasher.

Clean freaks stop reading now.........

BUT, to be honest the main reason I got it was so I could bathe my small dog in it :)