I've started using the inverted brew too, it's less messy and does give a better result. What I like best about the coffee is the lack of bitterness. I'm not an espresso drinker, but even the initial shot, while too strong for me to drink straight is not bitter. I also like the fact that the coffee is really clean with no grit.
Rave is the only coffee I've tried so far but it's lovely and they offer Aeropress grind as an option. I am considering a Hario hand grinder, although I don't know if the difference would be as noticeable in a latte?