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I have played against another rebel player that had two AT-RT's with laser canons and it made me keep my own AT-RT's back and behind cover to block line of sight. It is that scary.
The At-RT is good value for points and a auto include in any list for me. That might change when more units for the support slot are released.
I haven't used the heavy flamer option yet because I don't like putting my AT-RT's within range 1 of my opponent's units but the potential damage it can do is great and a good deterrent in objective areas.
I have two AT-RT's from the two core boxes I have bought. I haven't changed the AT-RT's itself so they both have the same pose but I did use some green stuff to model the shooting arm of the pilot to make it look different. I also changed the color scheme and skin color of the two pilots and did a quick and easy head swap. This way they don't look like twins to me. What do you think?