I bought a 2nd hand X10 mini pro three months back (dunno how long the previous owner had it, but I think it was just after SA release) and there are NO scratches on the display. Mine lives in one of my pockets without a pouch/cover.Only bad thing I can say about SE phones is the crap Display (Scratch easy) and personally I am not a fan of plastic bodies, but that's also the reason I dont like the S2.
As mentioned, the biggest drawback to SE phones is the lack of updates. The X10 mini pro is stuck on 2.1