In my opinion Melda has a few good plugins but the ones you're interested in are not part of them. Like some already said dealing with the dev is a bit of a hassle and hypocrite. Every dev has to be a bit narcisstic but he's exaggerating it. Maybe just a marketing strategy since people are talking about it.
The plugins are cheap and there are many of them. A sad thing about them is they aren't self explaining most of the time. You need to watch tutorials, read manuals or ask the community (which is really responsible and helpful). But I think if you've mastered them you have the knowledge to be able to code your own plugins XD
From my experience you have to really love them or you just won't use them. Try them and find out.
