Agreed with DavidX5, the threads is a possibilty if you are keeping the same axle and rebooting- on my old ones though the threads looked fine, i let my boots go for about 40-50k miles both inner and outer. In my case i opted to skip the dirty work now and replace it as a unit later.

The IR gun is probably more powerful from a quality tool maker like them, however at the price of the HF gun i cant complain about its capabilities, i got mine on sale cheaper then it is currently listed, $65-70 for me.

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2006 X5 4.8is Fully Loaded