To be honest I can't specifically tell you about that one, but as you probably already know it's a mechanical mods. Mechanical mods are good for atomizers below 1 ohms. What you look for in a mechanical
mod is what type of contacts it has (brass, copper, silver, etc). Silver being the best for it's conductivity, however most have copper or brass because it's cheaper and also is a lot better with heat. That being said, heat is a big issue. The lower the ohms of your atomizer, the more stress it'll be putting on your battery. Anything less than .3, you basically have a pipe bomb in your hand. Anyway, another thing people look for is button location, some people like bottom button, some people like side, others like recess. On the topic of buttons, people also like to check for the smoothness of the button when you fire it. See how smoothly it goes in and out, and whether or not it gets stuck. I've used a couple of avengers and cronuses and those normally get stuck, but there's ways around it. But I figure if you're spending that much, you shouldn't have to worry about it. And well that's all I can think of at the moment for a crash course on mech mods.
Oh btw, I recommend the k100 as a good starter mech
mod. It's really good considering it's price.