I'm a new Kubota 900xt owner and have added some Kubota accessories.  I got it with the glass windshield, added a Kubota heater and driver's side wiper.  I checked with my dealer; a hard door kit costs about $3000 and comes with the glass windshield (which I wouldn't need).  I checked some sites with aftermarket kits for cloth doors with marine vinyl windows for about $500-550.  Are these any good for general winter use down south?  Which manufacturer makes the best soft door product?  Any advise is appreciated.  Thanks!