Random thought.... I noticed in the Vaping Shozza's review that the wattage adjustment / indicator dial has no numerals other than 20, like the others previously posted about here. If the eGrip and iStick do indeed share the same electronics, and the eGrip is using a Mean Average waveform like the iStick instead of the more accurate RMS (Root Mean Square) (see PBusardo's iStick review) it would make sense to eliminate all wattage settings except for the device's maximum of 20 since the other settings would be overpowered, and inaccurate. It's a set to taste kind of thing, up to 20 watts.
Then again, it could have been just cost-cutting on the dial engraving..
I am still very happy with the eGrip. I've taken it on a few road-trips so far as well as daily errands, and have not had a bit of trouble.

I did start using one of my beck series drip tips (STR15) made "By Leo", and the flavor has actually improved
Beck Tips