If you want to kick it, you should get the larger Grand. It'll take a 18500 to go with it and you'll have to scrape whatever finish you have on the unit off where the kick ground(s) need to make contact.
BUT, I did that and then promptly went back to "native" 18650's and just adjusted the coil for resistance and placement - the RM2 is a ridiculously easy platform to build on.
You can go as low as about 0.7 ohms pretty safely (with 30A batts recommended) on the current Grand, and there is a subohm kit upgrade in the works (should be available later this month). Single or dual coils are possible at that resistance in the RM2, but other atties are available that are more purpose-made for duals (they must be bottom feeding modded - Rob sells an IGO that's ready to go).
I suspect that getting really low with the resistance isn't really your thing, though, since you're curious about the kick option.
Do they compare to dripping? He!!, yeah.
They are, essentially, drippers with bottom feeding. The bottle is onboard. They hit like a mule. They are nigh indestructible and every working piece is replaceable. What's not to love?