Well, it depends on what you are looking for. It’s great that they hardly have any restrictions on the free plan in terms of features and templates. On desktop computers, they place a pretty visible ad at the top of your website that is sticky (i.e. it will stay even when you start scrolling the page). Fortunately, on mobile phones, it far less visible and also not sticky. To use your own custom domain name, you’ll need the Combo plan at least, which is $11 per month.
These services can host your content on their servers free of charge, but in exchange for that zero cost, your online destination will have a less-than-elegant domain, such as jeffreylwilson.tumblr.com. That might be fine for a personal blog, but it will look too low-rent for a business that wants people to trust it enough to pay for whatever it's selling.