We finished a stage 3 build on one of these last week, made 261bhp and 392 ft/lb, so the power is there with the right components and mapping.
However, there is a reason that a £1100 turbo is better than a £600 turbo. I went through 3 cheap hybrid turbos on my last high power PD engine, they all popped at around 2 bar of boost ( around 240bhp)
The turbo dynamics turbos we have mapped to over 2.3 bar of boost and have had no issues at all with reliability.
If you want a cheap hybrid, i know where they are made for the company you mentioned, you can get them on exchange for around £350 but dont expect to push much more than 1.8 bar or 210bhp safetly, remember that a turbo can destroy your entire engine if it fails, especially when at high boost.