I've had a Chubby 2 in Best and Super, and a Chubby 1 in Super. The Best started out a little bit scritchy but softened up after a couple of weeks' use. It splayed like mad and became way too big and soft to enjoy fully.
The Super Chubbies' hair seemed a bit thicker, and I wouldn't say they were particularly soft. There was scritch there throughout the time I had them, and I used them 30+ times. They were as scritchy as my Duke 3 Best I had.
Of course, this may have been a particular batch of Super hair. The current lot may be different again. It really does pay to inspect a brush by hand when you're spending this kind of money. Brushes really do vary, which is to be expected given they are a natural, hand made product.
John