I haven't noticed any auger slippage on my Ariens926. So why do I need I (arguing w/self). Probably don't. That drive slippage although rare and in short duration is Bo-gas. .
I will be looking for one of these dual belt auger drive kits. The time when I get belt slippage is when I go through heavy wet snow, especially along the side of a street that gets plowed & has salt spread on it.
I have been blowing snow for almost 40 years, and I can tell you that slush will cause auger belt destruction in a short time.