trident clone: Coils are attached by putting the coil legs through large slots cut in the posts, and then clamping down a cap. The caps are slotted for a flat head screwdriver, and are easy to grip, so you can use it without any tools. One of the easiest decks to use ever, and it plays nice with kanthal ribbon. Single or dual adjustable air flow up to 3mm single/2mm dual, so you can run any coil setup. Copper center post, so it conducts better than most attys. Aggressive chamber reduction so it has better flavor & more vapor than your igo with an identical coil. cons: orings are a tight fit at first and require lubing with eliquid when putting the top cap on, after a few months mine is a lot easier to use. positive post insulator easy to melt because coils sit low, just watch your placement when building. The drip tip that comes with it doesn't fit well to make sure you have one you'll like on it.
Igo-w: like the igo-l but it has holes in the posts, and 3 posts. 2 air holes, so it's dual coil only. You can later upgrade it with a 22mm top cap and a copper positive post, which actually makes it a pretty good little atty.