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David Tubb’s Finalfinish

I used it on my factory Savage 12 LRP. Did it make a huge improvement? No. It did speed the barrel up about 25 fps and slightly improved the groups. The biggest improvement was barrel cleaning. The one thing I did not like was that it worked the throat a lot and pushed the lands out enough to change my reload.

If you have a new sub $500 rifle then it should help. I wouldn't use it on any aftermarket barrel as it would just be extra wear on the barrel.
 
I've used this on several factory barrels with good results (Ruger Precision Rifle, Remington 700 in 300WM and another in 6.5CR). That said, I don't use this on my custom barrels.

Shooting the finishing rounds, per the instruction, as light loads for the very first shots seemed to smooth out the barrels so they release carbon as fast as my custom barrels do.