TL; DR; – it’s expensive and it sucks… Better save some money and buy vinyl record!
For such a long time I’ve been using StartSSL certificates for my webs (and jabber….). But after all their affairs I lost my trust in them. And not only me – more and more companies nowadays revoking their CA from the list of approved and trusted CAs.
Also I’m lazy and always forget to renew the certificate so I was looking for solution that can auto-renew all certificates I need…
And last (but not least) reason why I wanted the change – it’s so popular now to use the Let’s Encrypt CA!