They are ok. Not a top model of simplicity. You have legacy, then prestige, and, conquest (the baby). They have free floating decks, however the conquest may either be manual or electric lift. Prestige has hydraulic steering, as well as lift and can even come 4wd. The difference between prestige and legacy is, deck size of 60". You also can have a loader or backhoe for the legacy. I have not seen a tiller for the prestige, but my legacy used to have the 60" tiller.
Conquest is a ok tractor. It will mow good, even blow snow decent. But it's a lawn tractor, it's not designed for much more than simple jobs. Some older conquests came with the k46 tranny, newer one's now come with the k66. But the drawback for a while was, conquest steering wore out and the tranny would burn up. But, I think today's newer one's they sorted a lot of those issues out.
Some people say they want to trade their deere for a simplicity free floating deck. Because going around trees, it doesn't gouge the lawn out. I can tell you personally, that is not always true. My legacy will either leave a spin mark around a tree, or the deck will dig a root out. Not talking the wheels, the deck it's self makes the lawn cut. The deck is long enough that, one side maybe low, other side is a tad higher. The deck will cut right into it. I have actually put bigger adjustable wheels on the deck to help limit that. So some point on my yard where I mow, my deck is no longer free floating in those odd spots.