I've had my 1845C for 20 full years now with no plans to replace it. New is much nicer but certainly no more dependable. This one I equate to a boulder at the end of a driveway dependable. Always there doing it's job without question, or problem.
I had my 1845c for 22 years. It was rock solid dependable and worked great for most of the stuff I did.
I spent a long time debating with myself if it was worth getting a newer machine.
In the end I decided it was and got an S650.
2 big item were the 2 speed and being able to run 22.5 snow tires. Makes it a far better machine for plowing.
Add in better cab, more hydraulic flow, more lift, better heat, AC, better cold starting, smoother controls, much quieter, etc.
It does each little thing better and when you add up all the little things, it's make a big difference overall.
Of course it also cost 2.5x what the 1845c did, but so far I've been very happy with it and I think it was worth it.