It does a pretty tight/good mtl (think Frenzy like) with the replaceable coils. I do not have the RBA yet, but the air flow adjustment has good range so there is a good chance it woul be good as well. The problem I have with it is with the pod itself. Way to dark, slanted, messy to fill, and on mine the pod is hard to get off and on. The claim 3.7 ml, but good luck actually filling it all the way.
I like the look and feel, but for me it is another case of style over substance. I used it almost exclusively for a week, and in the end was disappointed. My Breeze NXT is still number 1 by far. NXT is super easy to fill, great coil life, and great hit.
I have thought about getting a replacement pod for the Aegis, there is the possibility mine is defective. I do know when I switched to a coil from the extra pack I bought, from the coil that came in the kit, the vape improved.
As usual I can’t speak about flavor as I vape DIY unflavored freebase. I go by the hit satisfaction.