The zero turn market is highly competitive and saturated. Stihl is obviously banking on their brand name to sell these mowers. I believe it is a good looking mower, however, they are expensive and are very late to be introduced to the market. Time will tell. Yes, they are built on the Ferris platform.
I found one on FB marketplace that was brand new, had not even had oil or gas in it. Lady paid nearly $1100 at Ace Hardware, got it home and realized it was too heavy to lift out of her jeep, which was important since she needed to transport the mower to different locations on her property. Long story short, I got it for $430. It's a great mower, but I'm sure glad it's self-propelled.