There is nothing to really see looking at a H&R Cup kit. They look the same as the normal stuff regardless of make, if they didn't they wouldn't fit!
The H&R springs are black and the inserts/rear struts are silver.
The springs are obviously stiffer and shorter than the OE ones. The rear struts have an abutment stop on the body for the lower spring seat to sit against. If you fit the spacer provided it raises the spring seat by 20mm, hence you have the option of 40 or 60mm lowering.
The front damper inserts have a shorter piston rod to match the shorter springs.
The H&R Cup kit is exceptionally good gear.
However, if you just want to replace the springs, you could do a lot worse than buy the Eibach ones. Eibach is reknowned for making excellent quality components, and I've never had a problem with spring dislocation on 40mm lower springs/standard length damper rod suspension.