I have PSS10's and have had them for 3.5+ years and approximately 82k miles. They are just as awesome as the day I installed 'em...
They are (for a performance setup) quite comfortable. I love the ability to adjust the shocks for when I go to the track. I also drove my ZHP with these installed for following 2 Connecticut winters and there's not a spec of rust on them or even on the threads. There aren't any leaking shocks, either. So far the reliability has been on point and am very happy I spent the money on them. Let's not forget that Bilstein offers a lifetime warranty on them so when one fails, they'll send me a replacement.