The o-rings suck big time.
The preinstalled are too thin, the replacements are too thick.
The driptip is ok for me, but I just use some Kanthal Claptons at around 0,5 ohms and 50 to 60 Watts. A 510driptip just mutes the flavor.
The filling on the Medusa is not as good or easy as advertised. If you fill it with the 3ml, you'll have liquid everywhere when you put on the topcap. It's even hard to see, how much liq is already inside.
The only pro is its taste, which is really topnotch, and the hardened grubscrews.
P.S: Install coils with an inner diameter of at least 3,5mm and a lot of cotton or you'll get some extremely hot spitback.