LOL InsideSun is one weird 'company'. I think it's just one guy working out of his house.
DHL sucks. I have NO idea why he uses them.
Their 'econo' reconditioned ballasts are functional but suck.
Their house brand ballasts are fine but don't have detachable power cords (which I would consider standard) and there is an issue with how the whole thing is grounded. But they are cheaper than dirt so I have bought a couple anyway, and have to admit they have been perfectly serviceable for my needs.
I've also had an issue with stuff being on backorder.
It's just a messed up company but you get what you pay for and I'm cheap, so eh. My review is neutral.