Re: how much better is this?
If you rely only on the clamping force of the kit supplied tensioner bracket, no matter what you put around the frame to keep it in place or what quality of fasteners you use, eventually it WILL loosen and rotate inward. Sandpaper, innertube, duct tape or Heaven forbid, JB Weld, the bracket will at some point loosen enough that the tension of the drive chain will pull it into your spokes. When it does, remember, you read it hear.
As for constant checking to be sure it is tight, that will keep you out of trouble but keep in mind that what can happen, will happen and usually when you're riding, not sitting in your driveway looking at the bike
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"