I currently have the HS-85mg micro servo in my car and the HS-81 micro in my girlfriends car. Both seem ok for now, but I have heard lots about the centering issues and the HS-81mg. I purely bought the HS81 so I could see how the "preferred" servo as per HPI fits. I know the HS-85 required me to be a bit creative in how I got it in there (dremel is your friend).
I went to do a Google search to look for some information about the S3102mg and I have to say is ...that Alfred guy is everywhere! LOL
http://www.uk-microrc.co.uk/forum/in...ded&show=&st=&
thought u would get a kick out of that Alfred