I had a friend in DEA who carried one as a BUG. He liked it, but like all subcompacts, they have their downsides, such as a high-stress, "combat" reload will likely take a chunk out of your hand, since there's just usually not enough mag well to clear the meat of your hand.
But you may not even be carrying extra mags for your BUG, so that might be an issue you can live with.
Blessed be the Lord my rock, Who trains my hands for war and my fingers for battle! Psalm 144:1 For those who have hunted armed men, training will never be the same. Help the children of fallen heroes: Please Donate: http://www.specialops.org/