Concrete sinks are junk. That stuff is good for sidewalks and footers, but a poor choice for countertops and particularly sinks. This potential client thought hers could be saved. She was mistaken:

Nasty, horrific, unsanitary, no UPC sticker trash.

More concrete sink porn.

I suggest you research as to how many people who have had concrete countertops and sinks for 5 years or so would buy them again. They are nonexistent.

I would hope if there is anyone on here who had a bad experience would give some insight

Sorry but concrete counters are neveras nice as you might think . I aslo think integrated sinks remind me of the old cutured marble ones that I hated even when they were in .IMO if custom concrete work is a must I sure would not deal with Etsy to find someone in your area .

The local liquor store put in all concrete counters at their cash registers. It wasn't open 6mos. and it was evident they were a HUGE mistake. Pocked and chipped all over!! This was many years ago when they were all the rage. Stupid HGTV idea. We happened to be remodeling a main bathroom. We have an integrated sink. Builder grade from the local big box store but easy to clean and functions well. Looks as good as the day it was 'installed". Who knows what it is, resin composite of some sort. It came in several color choices.

Bought a house with concrete kitchen counters, lived with them 8 years, worked hard (always wiping up spills, cleaning daily, and polishing with beeswax occasionally) to keep them nice, but had little success. I hated those countertops, and replaced them with quartzite this year. Concrete is a terrible material for a kitchen or bathroom counter... unless it's a space you rarely use.

Looking at the material it’s not straight concrete but a glass fiber reinforced concrete. I do have it as a counter in my basement (was trying it). Had it for 2 years like it but it does not get the same wear as a bathroom setup. Does this make a difference?

Glass fiber reinforced concrete is done to avoid the expense for the use of reinforcing steel.

https://shuntool.com/article/does-concrete-with-fiber-need-rebar

I think that a concrete kitchen sink is a bad idea:

Native Trails sink after two years (it started staining and having issues at six months):

My understanding is that concrete bathroom sinks are a different story. Reviews for Native Trails vanity sinks are much better than the ones for the kitchen.

There is a nice restaurant near where I work that has long trough concrete sinks in the restrooms. They were installed about five years ago - the one in the women's bathroom doesn't have any stains or pits/cracks (I assume the one in the men's bathroom has held up also - but I have no personal knowledge of how it's worn over the years). I don't know if they've been resurfaced at some point or what type of regular maintenance is done on them.

However, concrete sinks are expensive - I wouldn't want to spend that much $$ on something that might not last.

Joseph Corlett has posted a photo before that shows stains under a hand soap dispenser. I assume that the way they are sealed makes a difference - but that photo made me decide against having one in my mudroom.

Concrete is a HORRIBLE idea. It is porous, scratches, and etches, just like natural marble would do. If you like wear and tear to be visible in an ugly way, instead of being a "charming patina", then concret is for you. It will always look like a mechanic's garage floor though.

Have a Corian fabricator make you something integrated out of a concrete look Corian. It's fabulous, and NSF Certified. Easy to keep clean, or just scrub with a bit of Soft Scrub if you've scratched it enough to hold toothpaste.

I think the corian idea might be good if you can get the right color,

Thanks everyone, i think you have all made your point. Looking at other options.