You also get full control over your attack and sustain (on separate dials), which is an exceptionally important feature to have in a transient designer. The others on this list seem to add a slight bit too much compression and don’t leave your drums as tight, and clean sounding as Auburn has managed to pull off.
It has the most control you’re going to get out of a free transient designer plugin, and treats your transients with the cleanest lens. The absolute best free transient designer has to be Auburn Sounds Couture.