The pricing is fair- it's really competitive to other providers, especially considering that all you need are your own servers! We didn't have any issues with installation of certificate or renewal process (which we did face when using certbot). I haven't used them enough yet but so far everything has been great; professional staff at TSSLs customer support center in Amsterdam who were very helpful even after hours!! Highly recommended. Price transparency - makes sure our hosting costs do not go unnoticed by clients. I like that it is pretty easy to set up, you can have multiple different keys with one certificate so if something goes wrong or changes we don't need an entirely new cert every time! There isn’t much as far my know about thawses but their support team has been great throughout our entire relationship (we've used them since 2014). The process of getting this done was quick once they got us approved by another CA which helps when your not sure what all options are out there in terms of certs/keys etc..