||available are awesome to have. The flexibility you'll get once you take the plunge is astounding, and that's just with the Elite series. I can't imagine the Nexus R5.
I'm sure you'll get that with pretty much any standalone, but Haltech's support is second to none. When I got everything connected and the car started, dude remoted into my laptop and had me in a drive-around/learn tune in about 30 minutes, and that was after setting up the interface and different tabs I would need in the map.
...and one more plug for them, they offer a 15% discount to veterans (at least they did when I bought everything about a year ago). That sealed the deal for me.