Bird,
Each foot of my KK tiller has two bolts. One is in the rear, and is the adjusting bolt, with five holes. The other one is towards the front and is the pivot bolt. So, to adjust the depth using these skid shoes or feet, I have to remove the two rear bolts, pivot up or down on the front bolts, and then put the rear bolts back in the selected holes. Are the feet/shoes on your tiller tied together so you only have one adjusting bolt?
This adjustment really isn't all that difficult, though a single central adjustment would probably be easier. I got the pivot bolts loosened up without too much trouble, and if I prop up the flap on the back of the tiller I can reach the adjusting bolt nuts fairly easily. I can see that if you didn't adjust these things every year and just tilled with them always at the maximum depth they'd probably get rusted solid. And as others have said, you could probably do that, especially if you are only tilling an existing garden spot. The tiller came with the bolts in the middle position of five, and that seems to be a good setting for breaking new sod, at least on my place.
I have no way to compare this tiller with other brands. The only other tiller I've ever used was a TroyBilt walk behind. That thing nearly ended my interest in gardening last year when I used it to break up freshly plowed ground in the garden. I felt like the tail of a happy dog as I was flung around behind that thing. My KK tiller lets me till the garden in minutes; has reduced lots of deep ruts to smooth surfaces; tilled up a 5x200 foot strip of new sod so I could put in a road screen of hazelnut shrubs in about five passes. And I plan to use it to smooth out the new lawn area around some additions to the house if these guys ever finish up and leave. So, it's been worth the $1,100 I paid for it to me. Sure seems solid. Aside from easier depth adjustment, I don't know what else I could ask for. I've seen a number of comments in other threads about how heavy it is and how it might be too much tiller for this or that tractor. I can lift it and use it with my L210, regardless of whatever the rated hp is.
Chuck