Well its not DC coupled (i.e. NO capacitors in the signal path) and it has a very low voltage swing - 200Vrms... due to the fact it has pre-amp tubes in its output rather than power tubes like the EL34. The bandwidth is not great and there is no distortion specifications at all (nothing vs output voltage and nothing vs frequency) which is a bit suspicious. I suspect the amp will have trouble driving Stax sr007. There is little information about the power supply but it does not appear to be fully regulated. As such it certainly does not look to be even close to a blue hawaii, mini T2 or T2 in specs and capability. Even the all valve Megatron has more voltage drive and almost certainly a better power supply. It is not known if the amp uses anode load resistors (bad) or constant current sources (good) for the output valves, but I suspect it's resistors.
On the plus side it does not appear to have an output transformer... unlike some crappy comercial designs and does not require any DIY skills. However, if you don't mind building your own amp you can almost certainly make something substantially better (fully regulated power supply, fully DC coupled, constant current sources for the power valves etc) for around the same price.