I shoot RAW, so there probably would be no advantage for me.
If you shoot RAW, you can switch the word 'probably' by 'by certain'.
HTP is absolutely useless in RAW, it simply shoots the scene with the Av/Tv parameters set, but with the ISO one stop lower than set.
Shooting at
ISO200+HTP produces the
same RAW file as shooting
ISO100 without HTP but the
same aperture/shutter parameters. So there is nothing you can get using HTP that you cannot get without making use of it in RAW.
So if you calculated the right exposure parameters, you will get 1 f-stop underexposure because of HTP, i.e. empty histogram in the end, worse signal to noise ratio, and less captured dynamic range.
As you can see it's a very advanced feature... to make your RAW files worse hehe.
HTP is only useful when shooting JPEG where camera processing will take care of a correct exposure in the middle range of the scene, but preserving 1 extra f-stop in the highlights. Good for high DR scenes shot in JPEG.