I'm not really sure what manufacturing springs round OE ride quality means. I also prefer a progressive rate spring like the Roush that gets harder as it compresses.
Depending on the drop, an adjustable Panhard Rod may not be necessary. I dropped mine on Roush springs and I didn't need one.
Same goes for camber bolts but they don't cost much anyway. The drop on mine had little or negligible effect on alignment and my tires are wearing just fine. Plenty of other lowered cars have had the same result. It's only on major drops that you tend to have issues.
If you're going to have relocation brackets, weld-on ones are better than bolt-ons but they're not essential.
I re-used my upper strut mounts. I never had a popping before and I certainly don't now. I'm not saying you won't but there's the choice.... It looks like all they're giving you is a new Ford set of plastic tops anyway which are probably available over the counter.
For my money, I'd buy a set of good shocks like Tokico D-Specs (about $550 and buy the springs separately. I have no problems at all with the Roush springs in terms of handling or ride comfort.
So yes, good price, but ask yourself if you need the things they're selling you.