Although the installation engineers were very friendly and the installation itself was competently done, we were disappointed with the amount of dust that allowed to settle everywhere. As drilling is an essential part of any intallation we would have expected them to have their own vacuum cleaner. They asked for ours half way through the drilling in a fairly small room full of music equipment. The only dust sheet they put down was immediately below where the drilling was taking place - which didn't stop dust going everywhere else... More consideration about this aspect of the work would have been great.