So far i've used the PicoAB and the SSR, both were great!
Now i have a NanoAAB, the new ones, waiting to be installed. Good thing abou these, they are easier to install because you don't have to solder directly to the mosfet. And also, if you have 2 guns, for example, if you wire the gun ready to take the mosfet, you can switch it betwen them, pretty cool..
Of course they can't compare with a micro switch mosfet like the BTC, but then again they are a fraction of the price, and imo they are a must have for any gun..any gun should have a mosfet..and they are so cheap lol