I use SiteGround for a simple business website built on iWeb and a WordPress site. I was previously hosting the iWeb site at MacHighway but when everything went bad at MacHighway in 2013-2014, I looked for a new place to host and chose SiteGround. I was impressed by their instant support via chat (or nearly so), and the people have always been so friendly. The WordPress site I've only hosted at SiteGround.
When deciding where to take my MacHighway business, I was a little leery of SiteGround because they are incorporated in Panama yet their offices are in Bulgaria, but I read many, many reviews and didn't see anything to cause concern, so I went ahead and signed up. Everything since I've signed up has worked well.