Thanks Kevan
FYI, those are similar rates and drops to the Hotchkis springs. Appears both are progressive springs, which is good for ride comfort (albeit not desirable for "ultimate" handling). These should ride a little, but not a lot, stiffer than stock. Stock SS and 9C1 springs are linear, 440 lb/in in front and 160 lb/in in back (same rates on either spring set for 94-96, the 9C1 springs are just taller).
Put in plain terms, the initial "hit" on these Vogtland springs will be a bit softer than stock, but they get stiffer the more you compress them.
From the description, I'd consider these springs if you are already looking at the Hotchkis springs. Looks like we need a few guinea pigs....and may have found some in this thread
bodean : not sure on the H&R Spring rate in back, but their front springs are linear and around 600 lb/in. The Global West front springs I am running are 750 lb/in off-the-shelf, and as modified by me (slightly cut, which increases rate) they are somewhere between 750 and 800 lb/in. That said, you can increase the front rate (a lot!) without impacting ride quality all that much, but increase rear rate even a little (as little as 10-15%) and you'll notice it.