Since building here in '89 I've had a 3 open station, one open station that I built a cab for and a factory-cabbed model. Hands down favorite is the factory cab. Second choice would be the
L3200 with the DIY cab. Still have the open station Ford we got back around 1991 for odds and ends. It's handy to have two tractors with different implements on some projects.
At 73 I don't have any trouble getting in and out of the cab. Can even manage getting myself in and out with our 2YO daughter. She loves to go along while mowing and with the cab, don't need to worry about her falling off.
The most enjoyable things about a cab are the already-mentioned HVAC (mowed yesterday in the heat with the A/C in the first setting), and not getting bothered by the dust, pollen and insects. It's also very nice to be able to run the sprayer and not drive through the overspray when the breeze shifts.
There IS one visibility issue that I've noticed. Depending on the angle of the sun, I occasionally get some reflection on the inside of the front window if I wear a really light colored shirt. Not a big deal, and if it's late afternoon i will often grab a darker shirt before mowing.