I am guessing home refueling units will build the market first. Then after there are more vehicles, CNG commercial stations will be economic.
I'm more of the opinion that CNG will show up in heavy vehicles (long haul trucks) and that truck stops will be the first wide-spread refueling option. If you have a home refueling station, what happens when you're away from home (unless your CNG is multi-fuel...and necessarily multi-tank)?? At this point in time, the only place the home-fueling station really makes sense is for the "heavy commuter" whose main travel is home-work-home. Now, admittedly that's not a small market, but that also means that said commuter also needs a second, non-CNG vehicle for long trips.
Either way....it'll be "interesting" to see how it develops. And I'm darned glad to see an abundant new energy source showing up.