I bought one a couple months ago to put in one of my two grow systems. Swapped it for a 600w and I got about the same results. The nug looked a little different, but it was actually stickier and stinkier than the 600. Darker green too. I'm gonna switch out my other 600 after my next crop.
I don't know about the appollo, but I know I'd rather deal with a US company when it comes to warranty and such. Common knowledge that the vast majority of products you buy are made in China...especially in the hydroponics industry, but good luck returning a generic quantum ballast to the factory in China. That's why you pay more for a quantum.