This will last the expansion if you meld it. Look at HW's Iron Works gear this set it basically the same as that as it also came out in 3.3 if i remember correctly. there will be 1 more set that will be "better" but it wont be an Omni set it will be for each class. if you are willing to skip over these then it will last you the expansion as regards an end-game crafter PoV just upgrade your weapons accordingly.

Also UPDATE to my rotation.

I am melded in the new gear now (unmelded weapons) grade 5/6 overmelds on left and right and cp's on the weps

Currently on: 1685 Craft, (using ala mhigan MH atm). New Offhand.
Control: 1742
CP: 493

New crafts now go to 86% with that rotation. if you are melded the same as me you can put an innovation in and make it go up by a few % i think to 90/91%. which means 25% hq mats = 100% guaranteed HQ