Okay, I've got four rounds in so far.
Honestly, I am loving this thing. I definitely feel a difference in terms of fatigue. My arm, back, and shoulders feel fresh after a round. Played two rounds back-to-back on Sunday: first one at Winget, second at Nevin. Everything above the waist felt great, and that's a Goodness.
However, I have noticed some knee tightness that I've never had before. I assume it's from using the legs a lot more to pull/push the thing, and if that's true, I expect it to go away once I get used to it. Just using the body differently takes some adjustment.
I haven't used the bottom storage for anything yet. The two bottle-holders work well with a Gatorade or large-ish plastic bottle. I can fit about six cans of beer up behind the discs, but it makes things pretty tight. So I just decided to carry less beer! How'bou'da?
The cart is Ninja-quiet, and rolls over practically everything. I have to be more aware of the terrain as I move about, but that's no hardship. I feel like it makes me focus just a touch more on the golf, and less on the chatting/sightseeing.
It seems inevitable that I'm going to take it to a course that won't be very cart-friendly. Those lessons will just have to be learned the hard way.
Thanks again, everyone. I very much appreciate all the input, and just having the forum in which to discuss it. KARTLYFE!