I just got into this game, and after throwing kerbals at the mun with acceptable success/failure ratios in the demo, I bought it, and certainly regret nothing. I puttered around in the sandbox mode for a while, and actually got a 26-ton rover, transporting three kerbals and two smaller rovers, on the mun, 87 km form its intended target, and completely spent on fuel and monopropellent, then took four hours to drive it over there. The terrain was scary as hell, because this thing couldn't drive down anything more than a 20-degree slope without deciding it can fly whether unfueled or not, and I ended up crossing a mountain range.
Flipped it dozens of times, but the landing was the most terrifying part: I ran out of fuel well above gorund while still travelling 30m/s, and crashed into the terrain at 50m/s. The rover only survived because it landed on the rear wheels first, then the front wheels, then rebounded, rolled a few times mid-air, bounced off its wheels again, before finally remaining on the ground and rolling, at which point I braked. Nothing else besides the 8 primary wheels and 7/8ths of the mini-rovers' wheels were damaged. And I'm not sure how the mini-rovers wheels popped since they're suspended about 2 meters above the ground. Maybe they absorbed some of the impact as well and it happened too fast for me to notice it.
Here's what it looks like on Kerbin:
Now I'm playing around in career mode, and that's kept me entertained quite thoroughly. I've so far been returning most of my samples rather than transmitting them, and designed a probe with nuclear engines just for a sun-orbiting mission, the science modules detachable with their own subsystems to return to kerbin and land. I got the first such module home, and promptly landed on a mountainside, resulting in it rolling down the slope and exploding. Yet to kill anybody, luckily.