Brand in domain

Hello,

I recently picked up some really good domain names.
Right now I can't do anything with it but probially the end of 2019 when the product comes out I can start earning some good money.
Now I wanted to start already with the site today so I am ready to go in a year and I have a big head start comparing to my competition.

However my problem:
I have the brand name in my URL's.
Examples: BuySamsungtelevision.com, buysonyphone.com, lambourghiniprice.com, blackhatworldforum.com you get the idea.

Does this matter for SEO?

Thanks

Usually its not a good idea to use brandname
In regards to seo sure it can help you short term, but i think longterm you should not use any brandname .