S-off with HTC Dev tool?

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http://forum.xda-developers.com – Just got my Sensation back from repair, so now it's already on 4.03 ICS. I remember from before there was some discussion of the new HBOOT version not being about to S-off. However, HTC offers the unlock tool. Just wondering if it's a bad thing to do using their unlock tool or does it matter? (HowTos)