Hi katroushka,
They are owned by Mattress Firm which is the largest mattress retailer in North America so they are certainly a legitimate business.
While I would tend to avoid most of the mattresses they sell there unless you can find out the specifics of all the materials and components in any mattress you are considering there (see this article) and confirm they meet the quality/value guidelines in post #13 here) … their adjustable beds or some of their accessories may be worth considering.
It also appears that they don’t ship to Canada even though it’s a Canadian domain and the top of the site it says “Shop Cananda’s Leading Adjustable Bed Shop”. Here’s a copy of the chat I had with them …
Elissa: Want to Save ? Chat Now and Save Today!
Enter your name and email to chat with me now. 
Me: Are your prices listed in US or Canadian dollars. I noticed they are the same as your US site
When you place an order with your chat agent, please mention code MGR19 for an added coupon savings. You can call us at 713-715-8440 between 9am-5pm EST. . Thanks so much!Jen GrassanoOlejo Chat Team Manager
Elissa: we do not ship to canada
USD
Me: It’s a Canadian domain and at the top of your site it says “Shop Cananda’s Leading Adjustable Bed Shop”
They didn’t reply to the last question.
It seems somewhat strange to me and you may want to try and ask the same questions to see if you get the same answers.
Phoenix