The Istick 50w was my first box. It worked great until I tried building on my then-new doge v2. When that happened, it shorted out and never came back on, even with plugging it in multiple times. I was building in a shop, so when it happened they gave me a new one, which also ended up shorting in a week. They're a great mod for tanks like the subtank or nautilus, but aren't up to par for RDA's. If you can afford the extra coin, both the sigelei 150 and 75 watt temp control devices would be a very reliable, fun upgrade. Cheers!