Let me preface this by saying I don't live in Europe so I've never seen one of these before. I do not know exactly what sounds they should have or how they should perform compared to other similar locomotives. But I will say I greatly enjoyed driving it. It's performance is very impressive both with acceleration and braking. The sounds seem realistic to me based on youtube videos I've watched.
Finally, if you'd like to "drive before you buy" you can find a BR 189 in the Train Simulator Academy. Try out some of the basic tutorials or make yourself a scenario with it.
+ Nice sharp graphics inside and out
+ Very nice layout on instrument and control cluster with instrument lights that are bright but do not glare.
+ Good accelleration and braking. Good physics in general.
+ All scenarios work perfectly
+ All achievements work perfectly.
+ Good sounds. (See disclaimer at the top)
+ Has scenarios on Hamburg - Hannover, one of my favorite routes.
- Not a darn thing. It's ugly? And that yellow... Fortunately you don't see this inside it ;)
There is one issue tho it's with the route not the locomotive. On one of the scenarios there is a speed drop to 60 kph. You get a warning for this inside the cab however for an extremely short length of track - a few meters - it's actually 40. But if you hit at 60 it'll take quite a few points instantly before you're over it. If there is notification on the track I could not find it. My advice: Hit F2 and save frequently.