That looks like wood, might be custom?

I know this is probably too late but if you are still looking there are often vintage live edge coffee tables on auction sites that could be upcycled as vanity counters.

Hi, do you have photos of the space? Is it a light or a dark room? I would personally choose a white or light grey quartz or something like Silestone. Maybe a marble vein in it, like Calacatta Gold. You need to get some samples to see the colours in situ. But if it is a very light filled room, you could also go for a darker granite or quartz.

Thank you so much for your response lifestyle kitchens :) Yes, I thought it needed support underneath and I did raise that issue with the kitchen company but they assured me that this is how it's done. I feel they just took the easy way out. What are the chances of this cracking? Do you think I should put my foot down and insist they redo it with the extra mdf support. I paid a fortune for this kitchen and I am so disappointed with the way they have handled matters. Thank you once again for your response. It is appreciated :)