I have XTR, and have for a few weeks. Here is what I have found out:

When I first got it and found out that it uses your own batteries, I was extremely pissed. I thought that I could never fly for real because my transmitter would always be on the charger. I was wrong. I haven't done any real flying yet, but in the 3 weeks I've had it, I have not ONCE recharged the battery. I removed the crystal/module out of my radio, and because that is no longer there, the circuit isn't completed for transmission, and no battery power is used. I started at 10.3 volts and am now at 9.7, no way to tell how many hours I've flown though. However, let me say this: Battery drain while using Reflex is absolutely, positively NO ISSUE. The program reminds you to unplug the transmitter when you exit, so no accidental drain either.

Physics/Flying:

The post earlier in the thread that if you fly to far away it resets is just completely not true. It resets if you fly over the pitts, and you learn not to do that after a few times. You can fly any other direction for as long as you feel fit. No reset.

3D- While not an expert, I have hovered a few times, but tried many. When I first started playing, I did the exact same as in real life. Fell out most of the time, stuck it a little. I am now much better. (Haven't tested myself for real yet). It also has a torque trainer that I found and am extremely impressed. Makes a joke of G2's training. It gives you the plane right in front of you in a hover, and before you start, you select your level, 1-4.

Level 1-You control throttle only, sim takes care of the rest
Level 2- Throttle, Rudder
Level 3-Throttle Rudder, Elevator
Level 4- All channels, no assist

That is how I learned to hover the Flip 3D, one I was unable to do before I found the trainer.

Now for the negatives:

Sound- Sure you can select 2 stroke for 4 stroke, but nothing like G2
Menu's not as fancy/attractive as in G2
Aircraft editing not as easy as G2, again because of the menu's layout
When you hit a far away tree, it sometimes may not reset automatically
Aircraft editing more a computer thing than modeling, you change number values for a bigger engine, etc instead of selecting a saito 180

Overall great program, was not made with the experience/leadership/big company support live G2, but for a little less than G2, with free downloads etc, a great buy, and like the screenshots show, the graphics are insane.