I think you'll find that many Crossfire owners would be smart to do this, regardless of the kit. Honest owners with lowered cars would agree.

The swaybar, even if it's not making direct contact, is still pre-loaded and the ride will be unnecessarily harsh. This adversely affects handling as well.

As for the camber/toe, both ends suffer from an inability to hold alignment, even in stock form, as the car ages. I know my toe is slightly off spec, and I'm still at OEM height. So a lowering job simply aggravates the problem.

The only difference between the H&R Cup Kit and any other spring/shock combo is the brand, and the fact that the shocks are tuned specifically for the Cup Kit's spring rates.

So with that being said, all suspension modifications should include the extra adjustable bits to keep everything in proper spec. You can cheap out and avoid it, but in the end you're stressing the mounts and wearing through tires prematurely, so the savings are temporary at best.