It really depends on which blaster you are looking at. For instance:
* Recon, no. Better off with S1+2 unleashed kits. Or wait for the Retaliator which will be better than both.
* Raider, no. Still better off to wait for the Rampage.
* AT, no. The Raider is just simply better designed, if you must get a Massacre kit get one for the Raider.
* Longstrike, maybe. I like the Longstrike personally, but being that it is a RP blaster it will never be as good as a LS or even a NF.
I have two Recons with S1+2 unleashed and an AT with a Massacre kit. OMW kits only make RP blasters less useless. When you consider that OMW don't improve on Nerf internals they only copy them in more expensive materials.
If you are lazy like me, or have absolutely no ability to use simple hand tools and have no imagination OMW is perfect for you.