Nope, sorry, he is shit!
He was no answer and say "f**k every RO GM" for more then 1 year! And now, when he need again money he saying: "hey guys i am back, bla bla buy more licences by 200$ without no support, without anything new, what do not protect against modern stuff".
Harmony is big piece of Crap by this price for this time. Sorry for so untolerant message from me.
The freelancers can write by 50$ server-client encryption in AES to protect against Openkore with custom protection's of injected dlls to the game exe.
Other security things can be easy maded by yourself at /db/skill_cast_db.txt by setting fixed delays.
Protection against memory-readers - imposible to make.
Protection about well knowed software = 10$ dll & sources, for check dynamicly opened process + hiden process to detect cheats by title/name/crc
Sorry, it's incorrect to say like that, cause each guy have their own opinion, but my opinion is:
I'm strongly NOT recommend to buy harmony!
Check better for internalguard protection, it's a little bit weak, but their updates more progressive then harmony.
It's the same, and cost just 20$ like it must.