I wouldn't even think about getting one without trying it out in person first. I also have several problems with that company. First , they go way, way overboard with the ozone sparing, environmentally friendly, green technology bit. The statistics they bring up comparing lawn mowers to cars is absurd. The talk about maintaining steep slopes up to 70 degrees. The four cycle engines on those mowers are only rated to about 25 degrees. The tracked mower cannot trim closer than about 6 to 8 inches so that renders it useless in my book. The caster wheel zero turn model might be ok but I doubt there would be much sense of control but I'll reserve my opinion on that till I try one someday. If they are so great why are they not burning up sales in stores? I'm a little nervous of a company with misspelled words on their website.

I stopped reading when they claimed it would 'stick' to slopes up to 70 degrees. I don't know of anything that can stick to that slope. And then as mentioned above, I would really like to see a 4 stroker work a near vertical slope and not tumble back down with a seized engine from oil starvation in the crankcase. It's almost vertical. They talk good talk but I think I would want to see them walk their talk and then I would have to demo it after they showed me.

When I read the site I thought it only claimed 30 degree slopes. That's about the same as the robotic mowers that are fully automatic.

The website has advertising from google adsense. If a company selling $2,000 mowers needs to make a couple of extra bucks a day through advertising on their website, it indicates they don't really have good sales. If they don't really have good sales they probably won't be around too much longer.

I see now the $5k model goes up to 70 degree slope. If your dad really has a problem mowing you can just creage mulched garden beds on the slopes. If he can't operate a mower anymore, $5k covers a few years of professional mowing service.

If you want to get it for him as a toy then go ahead, otherwise, tell us more about the property he will be mowing/maintaining and we will try to give you the best option (in our opinions). Just remember that buying a guy a mower is like your Dad picking out a purse for you, you might be better off letting him make the choice.