I've never used an HST CUT, so maybe I should stay out of this. However, I spent 50 or so hours this winter moving snow at the county airport with a NH TV140 bi-directional tractor (105 PTO HP) with HST. It was my first exposure to HST after decades on gear driven Ag tractors and I wasn't all that impressed. In fact the most impressive things about that tractor were the constant HST whine and the fuel consumption. The thing guzzled diesel fuel at about 7 gal/hr or more whether it had alot of snow to move or only a light covering. It seemed to need a lot of fuel just to move its bulk around. Glad the county was paying for it & not me.
Part of this, I think, is that with an HST the engine is set at a moderately high RPM, somewhere near rated PTO speed, and speed control over the ground is managed with the HST lever. With a gear tractor the engine is often idled down well below PTO speed and a higher gear selected if the load is light. Only when the going gets tough is engine speed brought up and a lower gear selected. The HST's primary HP loss occurs at the wheels, not at the PTO. In order to compensate for this when the PUSH is really needed, more fuel must be burned. This is something that gets scant discussion in the HST/gear wars on TBN but, with the cost of fuel, warrants more.
The new HSTs may well be bullet proof, I dunno. But it's hard to argue with old gear Ag tractors that are still going strong in spite of abuse dished out by a variety of disinterested users over a period of 40 or 50 years. Would a modern HST have stood up to the same treatment over half a century? No one will know for another 50 years.
The Conventional Wisdom is that gear is best for ground engagement (plowing, disking, etc) while HST is best for serious loader work. That's reasonable enough but to each his own. Once you get the feel of a gear tractor you can do rather smart loader work with it...and I value that feel and gear economy more than HST convenience.
If I had the money to spend for HST, it would go for increased HP or more implements instead.