^ Agree!
The Tornado's batteries have twice the amperage of regular Joye 510 batteries. My tornado produces slightly more vapor than my regular Joye 510 and slightly less than my Protege.
In my experience, taste seems to drop a bit as the amperage goes up.
The Tornado doesn't lose hardly any flavor, but maintains great vapor production thoughout it's HUGE battery life. Not bad for an $80 kit.
Amperage is sort of a measure of current. mAh (milli-amp hours) is the capacity of the battery if that many miliamps is drawn for 1 hour. A device pulling/using current from a battery draws a certain amount of current. Think of a millamp as a unit of energy. Let's say a device draws 450 milliamps to operate. If it is drawing that current from a 900 mAh battery you might expect the device to operate for about 1/2 hour before the battery is drained.
Voltage is the potential and will drop off as the battery approaches being drained. A battery will sort of deliver constant power until it starts to get drained and then everything drops off. How fast it drops off at the end depends on the type of battery. It's like your flashlight on an old style battery will gradually get dimmer and dimmer for a relatively long time. On something like a Li-Ion it will start to dim and then very quickly just go out. Not a whole lot between full on and full off.
So... you would not expect different mAh ratings of batteries of the same type, used in the same device, to effect taste or vapor or anything. Just how long they operate.
Now, having said all that. It would matter if the tornado is not the same device as a Joye 510 (and not simply re-branded). It seems that there is a measurable voltage drop across the 510's electronics (see footnote). If the tornado incorporates different electronics (mainly the switch) then there very well may be a difference in taste, vapor, etc. But that would be because the end device (atomizer) would be receiving a different voltage. Still nothing to do with amperage/mAh ratings of the battery.
footnote: Thank you Dr. House -- dang it, I can remember your avatar but forgot your screen name

Found it. Thank you Scottbee.