Yeah like was said about the shuttle shifter[at least on a ck30],you got to clutch it,its actually a forward/ reverse lever. Only advantage I see in it and just having a reverse on main shifter is it allows different reverse speeds[the faster the main gear you are in,when you put shifter in reverse,the faster you go in reverse].
Like said,don't have hydro,but the only advantage would be loader work that I can see,plus maybe real slow work,was kinda thinking along those lines when I bought mine concerning tilling,but first/low range works just fine for tilling[for me anyways],would probably go a little slower if I could,but than again,now that I know I can till and do a good job at that speed,wouldn't want to go slower.
One thing for you to think over is what kinda tires you want on it before you buy it,ag's or industral,kinda likeing my industrials[so far],but ain't tested them in any real snow or deeper mud. They do have more side ways stability,especially when loaded,in my opinion over ag's,but would say ag's would have to be better in deeper snow or mud. Industrials are supposed to be a tougher tire as far as punctures,but don't know that for sure,mines got 6 plys,don't know how thick ag's are for it.