Are the incase/specks cases for the mbp harmful or does it actually help?

[jjahshik32]

I've seen the video on youtube and 1 blog about a user that had her macbook (plastic) all scratched up by using the speck case.

But I have used the 15" mbp with the speck case for 3-4 months with no scratches and seemed to protect it pretty well.. but took off the speck case because I've heard about the speck cases actually scratching up the mbp..

Now I'm thinking about buying one for the 17", anyone here knows if its safe to use a speck case on the mbp?

 

[RITZFit]

I've never gotten any scratches from my spec case. Just clean the mating surfaces before putting it on.