Wow, that seam looks good to me, and I agree the vein matching is well done! When I had my kitchen countertops fabricated, I chose the Silestone quartz and do not have any seams.

It's not bad, but the fabricator didn't use a factory-specified adhesive for color match. It's too translucent which shows up as the medium gray shown.

I think the colour should have been better chosen for the seam! But in general on one tone surface you can see more seam, than where there would be more action! Sharing my seam of porcelain slab! I hate seams anyway, but I only notice it when I do photo in that location!

" I think the colour should have been better chosen for the seam "

Two years later not much you can do about it now, other than the op changing it themselves, if they have not already.

it really depends on the price. Of course it wont be acceptable if you pair a normal market price or premium