Hey Korie, welcome to the forum! The SX350J board has been around for a while, and IMO, and lots of other people's, it's the best board for 75 watts and below. It's upgradable, the company that makes it has been really good about making updates readily available, anytime a new type of wire or something like that shows up they come out with an upgrade to make the board work with it. IMO, I prefer it to the DNA 75, for a single 18650. The DNA doesn't work well with a single 18650. The SX350J board is also much easier to use, it will work right out of the gates, you don't have to plug it into the computer and fiddle with it. One of my favorite things about it is the way the power presets work, you can set five different power levels that you can jump back and forth between really easily, without having to scroll thru the range of power. Additionally, for any given power level that you have it set on, you can adjust the ramp up. Say your on 50watts, you can also choose to have the power come on slowly, or spike really hard at the beginning of your hit, there are five levels of power preset, (ramp up) at any time. This is my fave part. From a modders' perspective, I've put hundreds of these board in mods and have never had a problem with a board, any DNA, 40, 75, 200, I find to be quite finiky in comparison.
Besides the board, the sx mod is one of the devices I am most proud of. It's built like a tank, it's not just a box with components inside, the form is as absolutely small as humanly possible for the given components, it's got adjustable 510's, adjustable battery contacts, I think anyone who owns one will tell you they are happy with it. To be honest, I would rather just hang on to it myself for the money, but I've already got two myself, and well, that's just being selfish, haha.
