MP3 bump stops for P5!!

I'm ready to install my Eibach springs. I read from the protege FAQ that they recommand using the MP3 Bump stop instead of the Factory P5 bump stops. I want to know what's the advantage of using MP3 bumpstop? Also for ppl with Eibach,and factory shocks,how's the ride of this setup? How long have you had them?How are they holding up? Thanks
 
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