My info on the Magic rack is second hand only, so take this with a grain of salt if you wish.
By nearly every account the product yields racks as good or better than any other product. Hard not to like that.
It's way cheaper than the Sardo, or my current favorite the Delta-13. In pool halls, where they might get rough treatment, they might have a short lifespan, thus being more expensive in the long run, but that's just speculation. Plus, owners will still have to have regular racks for all 15 ball games.
The very high percentage wing ball issue is also an issue with the other two products that produce excellent racks. It's a function of the rack quality, not the product. And it's easy to fix, i.e., rack with the 9 on the spot.
My understanding is that in practice, in 9 Ball, problems associated with deflection, or balls stopping on the template are minimal.
What's not to like for 9 Ball?