Here are some photos showing the whole island. From a distance you can't see the issues.

Are there 2 seams on that island?????? How big is it...if I'm judging the size correctly, I don't see any reason for any seams. Definitely let them know you're dissatisfied. At the very least, they can explain to you their reasons, if they have any that are legitimate, for the issues you have described. Although, honestly, if the company was cheap enough mismatch the pieces, then they probably aren't the type of company that will come out to fix it, let alone replace it. Unfortunately, with countertops, any discount or bigger price tag determines the quality of your installation. May I ask how much you paid for these tops and how many square feet there were? If they charged a fair (as in not too low price), then I would recommend insisting that they at least try to fix the issue. If you got a super low price, then I would recommend trying to find another company to come out and fix it, because bottom dwellers don't care about making or fixing mistakes as long as they got your money.

I'm inclined to agree with Granite Grannies. Your island doesn't appear to be large enough to require seaming. The fact that the seam lines up with your faucet leads me to believe that the slab may have been damaged when they bored the center hole for your trough style sink and rather than replace the slab they have pieced it together.

The island is 11.5 feet long and 6ft wide. The company that did the work has been in business since the 40's. I don't want to say how much it cost. Let's just say that it cost more than the new car (Ford) they gave away on Wheel of Fortune last night. The seam is in the middle of the faucet to make the seam the line "less noticeable," this was agreed on prior to fabrication. Below is a picture of what The Galley Sink will look like when complete. I just don't get how the seams on the edges to make the bullnose are so slight, yet the middle is so large. Just seems to me that this was lazy work. The veining going the opposite direction on the front piece should have been caught before it left the factory and definitely at installation. They should have never installed it in my opinion.

The sink is 5 1/2 feet long. Maybe that will give you a better idea of the size of the island. Thanks for your insights.

Ok. Then it is long enough to warrant a seam at the end. If they are a reputable company, then I'm sure they will be more than willing to address your issues.

If it drives you crazy get it redone regardless if they take care of it or not. It will always bug you. It is going to be beautiful.

This situation reminds me of when we had our swimming pool installed, by the most reputable pool construction company in the area. Been in business for generations. We'd checked references, done site visits to examine workmanship, looked at BB ratings, etc. (no Yelp or Angie's List back then).The business owner had personally prepared the bid, and were assured he would have a hand in the project. We were confident that our pool would be well worth the full retail price we were paying for the best contractor in the area.

It took a month or so to complete the permits and the ground was excavated. Then, one thing after another started to go awry on the project. It took constant (daily) oversight and many do-overs before we got to end-of-job. There are still some minor defects that bother me to this day.

That said, what we ultimately found out is that the business owner's wife got sick - and died - during the course of our pool installation. No one made any mention of it until we held back funds at the end for resolution of final defects and permit sign-off by inspectors.

I hope this isn't what's going on with your countertop project, but if you're working with a reputable company who's work isn't up to their standards, please have a sincere discussion with the owner.