What else is there to say? One of the best compressors ever made will now fit in your 500 series chassis. If you aren't familiar with the 160a, a quick search will show you nothing but praise for these. Good value.
I swear this particular unit (with this mod) sounds more aggressive than my 160xt; so I just use it appropriately...Sounds more like an 1176 and/or an older 160. Love it on loud lead vocals, snare and I am still experimenting. Distressor-like is also a fair comparison, I guess.