The best thing about Dmarcly is that it helps to keep my emails safe by making sure they are not being sent through spammers or phishers which in turn makes me feel more secure when sending out important information such as passwords via e-mail etc! I dislike how there isn't any way of adding multiple domain names for one account (which would be useful if you have several sites).
It's also quite expensive compared with other similar services like Mailchimp who offer free accounts but don’t provide DKIAM protection unlike their paid version - so this can cause problems too sometimes especially during campaigns where we need many domains added at once i think? We use dmarclys mainly because our clients trust us enough knowing what an effective service provider we really am.