The Thrash is an awesome ball. I have had mine since early June and still love it. It offers great reaction and punch at the pins, and at the price point it is at, you cannot beat it. I tried a Threat, and the Thrash is far better in my opinion.
I believe the Thrash did not take off as well as it could have because of the release time. The Crunch, the Thrash and the Super Freak were all released at about the same time, which was after the league season had already ended. If it had been released in August there would be as many people throwing the Thrash as there are throwing the Triple Threat.