I have tried stock, NAPA, Rancho, Skyjacker, Trailmaster and Revtek. All of them but the Trailmaster SSV leak in the cold. I had a set on a 95' Bronco for three years and they were still holding when I sold it and I have had them on my 96' since 3-28-03 and they are still holding. The Revtek's on the Excursion are not leaking as bad as the others did but they are a little wet around the seals. I will probably replace them with SSV's before long or I might try a set of Bilstiens to see how they do. I have heard that there are only a few shock manufactures in the US that sell shocks to all the different brand names but I don't know who makes which shocks I just know which ones blow in the cold. As long as you live where it doesn't get real cold the Rancho's are great. I really liked them the first summer I had them.