Those are pretty nifty.

If you put one in the buckle though, just be sure to actually use the seat belt itself. The buckle has a sensor that lets the supplemental restraint system (SRS) know when the seat belt is in use or not. In a minor front end collision, below a certain threshold but above nothing happening, the SRS will activate only the seat belt detonator (retractor) and not the airbag - unless the seat belt is not in use, in which case the airbag will detonate. So for that middle ground impact with only the extender installed, you get nothing except a face full of windshield. For a serious impact, the system goes straight to seat belt retractor AND airbag.

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