I really like the D2 myself.  I also have the Sigelei mini too.  The D2 is much more comfortable in your hand, and it also gives you a lot of room to grow.  75 watts, plus the possibility of Temp Control. The only down side to the D2 is you it does not have step down.  There is a workaround, but if you are running it in wattage mode it will not put out less than battery voltage.  This may not be a problem if you are using a higher ohm atomizer. I have no experience with the Disruptor, but Innoken has always built good products. If you do go with a mod that uses an 18650 please buy your battery from a reputable dealer, and buy a name brand.  Here are a few good choices: Liion Wholesale - HG2 Illumn - HG2 or Liion Wholesale - 25R Illumn - 25R