Hi,
Let me give you some alternative products, that are also worth it to have a look at.
Servonaut is state of the art, but if you do not need a cruise control have a look at Modellbau-Regler.de
http://www.Modellbau-Regler.de. I had the chance to test the Truck ESC and it's fantastic for a great price.
Regarding Sound I'd like to introduce the
USM-RC-2 module from Beier electronic. It's an absolute fantastic sound module including a complete light management system and they also provide a trailer module with an IR communication.
All my Trucks do have a combination of Servonaut (standard and cruisecontrol) and Beier USM-RC-2 and IR module and I love it.