The SC 600 is a good gun with a few flaws. I don't think it was Worth the full price that was charged ($20) because that was the same price as the CPS 1000.
The 600 has okay output, somewhere between the XP 110 and the XP 90. This is for the best, because the 600 has a pretty small PT.
What this gun doesn't have in output, it makes up for it in power. It almost stings to get hit with one of these things, because it combines a CPS PT with a small nozzle.
Because my hose has low pressure, the QFD won't fill up the tank, but it will fill the PT rather quickly. I have yet to test the QFD on a higher pressure hose, so I don't know how long it would take.
It weighs practically nothing compared to the CPS line. It's so light, it even lacks a shoulder harness. While light can be good, it also means that the 600 can't hold much water.
This is a good gun, but not at a good price. If you find it cheap, by all means, go for it, but if all you can get it for is full price, the 1000 is a much better deal.