When springs are paired with the right shock setup its usually fine for the car. Cobbs 02-05 springs I know were desinged to work with stock components. It does still wear out the stock shocks quicer as the Cobb and an other other spring for that matter is stiffer than stock. So you can get them, and put them on now, then get better/stiffer shocks to go with it, or do them both at the same time (which will save time and money). I have met several people with the Cobb springs, they like the look and feel of them. Several were still on stock, some upgraded other suspsension parts.
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX