Your countertops look amazing! Great choice!

It does look great. You paid a reasonable amount for a large kitchen custom fabricated and installed with full back splashes selected from higher end raw slabs. Are there less expensive ways to produce the effect? Sure. Pre fab slabs in the colors and materials more commonly available. Simple edges. Standard sizes. Tiled backsplashes. Limited sizes for islands. Skill levels and abilities of installers vary widely. While the most expensive price will not guarantee fabulous work, the lowball price almost always comes with exceptions.

I chose ended up choosing Torquay on my perimeter countertops, over my white, painted cabinets (Sherwin Williams Alasbaster). I did not follow my decorator's advise of Sherwin Williams Snowbound on the cabinets. I chose a softer white. I believe Snowbound would allow a better contrast "pop" to the countertop. Still a white kitchen.

I had a rude awakening trying to use Torquay as my backsplash. I so wanted, love the look of the same material counter to backsplash. I have about 20 sq ft of back splash, less than you have. My contractor wanted an additional $3000 for the backsplash. Hearing all this about heat and Quarts. I asked the Fabricator to warrant its application, which they would not do. I ended up with tile....

I really like your countertops and backsplash.

That is about average. The slabs start at about 1300 each if you get jumbo slabs and can go much higher if you get any of the more exotic patterns. You would have needed at least 2 slabs for your kitchen (maybe even 3 if the book matched your backsplash). Material cost is a small portion of the fabrication cost - so you are at an average point. Your island looks unsupported though. If they didn't install metal bars under it, you might want to add korbels to support it

Cas is an idiot. If he was Chinese he was Chinese. She was trying to differentiate between them GROW UP!@!