I have a ton of rda's and rta's at the moment, I will share with you the ones that I use and work great. I can honestly tell you I own 3 with 1 on the way of the Helios RDA, I have advised many friends to get one and all are extremely happy with them. Most replace a trident or Igo-l with it. It is one of the easiest to build on rda I have ever used, and I have a lot before I found the helios. You can find clones for under 10.00 and besides machine oil they are going to perform flawless out of the box. I have a couple Igo-l's I use for flavor testing and again cheap and work but limitations a plenty. I also own many rta's and all site now besides my aqua hybrid matched to a origin, even my kayfun sits and I hate dual coils on everything except my Aqua. the Aqua has been flawless since day one and never an issue where the Kayfuns I have had many issues despite popular belief....I own a ehpro/tobecco and another so I own 3 but all have there issues but still great devices. I would say hands down get a helios clone and be happy, I have a clear top on the way along with a taurus and omega to find the perfect match for my Paragon mod.... Chances are I am going to make a copper top for the helios because its just that good. hope this helps you some, Strapped