If you really want more, wait until next week or so and
buy the ML, which will have a few more features, fix a few issues like the battery cap, and depreciate slower (the M Class is tanking in resale value
fast if you follow the Facebook SX groups, just like the S class took a value dive just before the M was released).
And if you're worried about regulations, I still really really wouldn't worry about that causing mods to dry up anytime soon.
Seriously.
If the FDA regs get approved TOMORROW, there's still a mandatory 2 year period where they can NOT be enforced. And even then, the FDA has NO CONTROL over electronics, batteries, wire, wick, etc. All they can regulate is the stuff in juice and how its marketed (that does include pre-juiced devices like Big Tobacco cigalikes, and the only way they can regulate electronics, batteries, wick and wire).