5/5 stars. Excellent.
A sonic weapon on steroids. On wheels. And allegedly watered down from early Mars patters. It would be better suited to a titan. But that's why it is in the Lord of War section. You won't need much else on the battlefield with this, and you're not making too many friends either.
The Sonic Destructor is dreadfully impressive. First up, it is a destroyer weapon. Read it and weep. Oh, and the range of 72 beam is awesome, coupled with 5 inch pie plate, at S=6 and importantly AP=2. Things will just die to this. It doesn't really need anything else, but it gets them anyway: murderous strike, pinning, ignoring cover, armourbane.
It also has AV=14 on the front and 14 hull points. That's before we mention IWND.
It costs a lot of points. They are points well invested all the same. There are only two real defences against it. Firstly is to adopt a "cloud" formation (scatter everything far and wide so that some of your army survives). Secondly, take it out before it takes you out.
There are no upgrades here, hence no build to discuss. Pay the points and good luck to you.