Free website builders have their place, but for serious businesses or businesses that want to be taken seriously… no. I mean if you are just starting your business and have no budget for a website, then yes they are fantastic.
The reason they aren’t that great:
The biggest thing I hear as a web designer is that we are going out of business because of the free builders. That is totally not true and just more fear-mongering.
This was just my two cents.