Real thing isn't small enough for you? lol
I got one this weekend and the wife and I only half joked that she got a new tractor, not me, since it's just her size. It's a little small for me at 6-5 275lb
Leaving it engaged will lead to driveline bindup wearing or breaking wheel bearings, axle & diff gears, driveshaft, etc. The selectors and clutch packs are running in an oil bath or are otherwise lubed, right?