Not sure... but pts is in cooperating in a big way with kwa with both the erg and gbbr.
Will the erg be worth it? So long as its the same price or cheaper than the TM then quite possibly. The ojly problem is that the tm has a lot of aftermarket parts now and unless the kwa's recoil is significantly higher, I think most people will stick with tm.
It won't be a bad gun by any means, how it compared to the tm sopmod series will be interesting .