Initially you will get a smooth ride if your not looking to drop so low. But after a couple or so thousand miles, you will start to feel it get rough. Reason is your stocks shocks are not made to specifications of being on a shorter springs. This also will vary on the way you drive, the types of roads you have or drive on etc. Coilovers will always be better if your looking for real performance but the price will cost 9x-20x the price of that of springs. I went with Ohlins, best ride ever, smoother than stock, responsive, ability to adjust height, ability to fit different size wheels, corner balancing, etc.
Bookmarks