New supercharger issues

I am going to be getting a new supercharger next week -- per the "rattle" special attention notice. GM is covering it, since they deem I have the "rattle" -- so that's good I suppose. --- I was just wondering if anybody who has had this done has had any problems with the process or with the new supercharger? -- and will I notice any difference in how it performs/drives, etc? -- Thanks