I've got a
L4240 HSTC. Love the cab. Visiblity 360 degrees is good. Looking out by your feet or out the lower rear glass is good.
Instrumentation is easy to use and read.
Control levers on the right hand side (rear and fel) took some getting used to, but the arm found it's sweet spot.
Control levers on the left side (cruise and l,m,h speed) are easy to reach.
Tilt wheel makes getting into it fairly easy, and I'm a big guy.
Seat is more comfortable on this one that the
L3430 I used to have.
I smoke and they don't offer an ashtray, so I made one

Overhead controls (wipers, heater, front lights) and the radio are easy to find/read.
Interior light works just like on a truck. Nice when you use it in the dark hours.
All in all, I'm very satisfied with the cab.
Out in it today with 10 degree temps and in a tee shirt was great

The heater kicks butt. Haven't used the a/c yet.
Hope this helps. I'm sure others will post more good or bad.
Kit