Here is a Battle Report from a player using the 'try before you buy scenario:
AAR -
Ran a demo game last night for my D&D Encounters group to see. They're all broke right this second, but they loved the concept. Long story short, humans ended up winning!
Humans deployed sneakily (all behind at least soft cover), with one of the HMG deploying in the middle wooded area... figuring the tripod would most likely come closest. Martian set up about as far away as possible (1-3" from the edge of the table), since their player loved the Focused variant of the Heat Ray.
Turn 1 - Martian tripod moved forward 6" (didn't feel like moving full speed for some reason) and fired upon a blip at nearly full range. That poor scout never had a chance, but his comrades elsewhere were saved a grisly fate by his distraction. The player was annoyed at the fake-out, so he moved the tripod in the second movement to be able to Sweep the Heat Ray.
The human player basically stayed put, moving some blips in the second move phase.
Turn 2 - Human player won initiative, successfully rolled for the Rough Riders, and they were all allowed to move. They fanned out, almost pincer-style to either side of the tripod. The blips moved away a bit in the second phase to counter the Martian move.
Martian player moved between the middle and left woods, toward the side with only one Rough Rider, and did a Heat Ray Sweep on two of the blips (barely got the edge of one of them). One was fake, the other an actual unit. The doughboys were dug-in, and still two of them were vaporized by the Heat Ray. The soldiers valiantly passed their morale check (crit!) however. The tripod then moved in closer to assault next turn.
Turn 3 - The Martian player won initiative, moved toward another blip to reveal another doughboy unit, and decided to sweep them in stead of finishing off the wounded unit. This attack decimated the troops, killing four of five, and sent the remaining solider fleeing.
The human player's Rough Riders were able to close the distance and miraculously ensnared all three of the legs (out of six cables total). Sensing a weakness, the Human player went for broke and revealed nearly all of their units (including the HMG that had been waiting in ambush in the trees) and proceeded to pepper the immobilized tripod. This furious assault from all sides led to the spectacular demise of the tripod, as it fell and exploded upon impact... though sadly taking the Rough Riders and remaining member of the battered doughboy unit with it. One could call it a Pyrrhic victory, as the humans lost four stands, with a fifth wounded.
All in all, very fast game, very fun. I can only imagine the awesomeness of having more rules/options & actual figures to negotiate around the field.