In my opinion, it's a very cheap and worthwhile easy to do upgrade, there's not a huge difference between the sound bomb and the mini version, the former being much more complex and fiddly to wire and hide away, I went to the trouble and it failed aftera couple of months. Returned got a refund and went with the mini, this was on a Triumph Street, when I bought the Beemer I ordered the mini version before I took delivery of the bike in readiness.