Its a nice equip, Stone Barrages a good ability. If Surge : Rock was +damage for every 1 champ and not 2 it would be better for potential Macadamize combos. Still a solid equipment though.
I'm honestly unsure of what deck to place it in. In goodstuff, Tactical Manual seems like it would give more bang for your buck, while in Grints I prefer to run Stonearm Sashes. Do we really have a "Rock theme"? I'd argue that Grints are as close to that as we'll ever get. But perhaps in conjunction with Terrain Stabilizer.......
It should give stone barrage and rock defiance. If the champ already has rock defiance, than it gain surge: rock instead. Pratically a more aggressive version of stonearm sashes