The power supply is fine if you're using 1070s with single 8 pin PCI-E power connections. Some factory overclocked cards will need an 8 pin and a 6 pin or 2 x 6 pins and the GQ 650 only has 2 x 8 pin connections.
So quality is fine and it's plenty of power but I still wouldn't use adapters with it. Single 8 pin powered cards are fine.