I just put my Aluminum DS in yesterday in less than 20 mins including jacking up the car. I didnt replace any seals either but they looked fine.

Conclusion: Noticable difference and can totally "chirp" or more like "squeal" second harder than ever. Definiatly feels more responsive when you slap the gas. no problems here.
Then i took it strait up to 100 mph and was thrilled to have no vibrations at all!!!!!!!