There are now two people in the UK who fitted the first batch of these 19t turbos, so far both very happy and no issues. Full spool is around 3400rpm looking at the logs, I was at the Dyno two weeks ago and they made 554/600lbft at 22 psi and 7 degrees timing with 99 RON fuel only.
I ran GC turbos anywhere from 25 psi to near 30 psi at the end. Saying these aren't true TD04s I can tell you they performed great.
I had to limit boost in low rpm to minimise the risk of bending rods. They are more than enough for a stock N54 block.
The China 17Ts have performed very similarly so I can only imagine the China 19Ts will be great. Plus at such a low cost it's not going to break the bank to try them.