Danny,
I have the RDC100. It's not a bad machine. I only have a small garage, so space is a premium, it fit's under my lathe and the posable hose can be positioned where I need the extraction. But...
It is noisy. It's basically a 'Henry', (the Vacuum cleaner with eye's), with a larger metal collecting bin and 4" hose. So I only use it when needed, most of the time I have and use a ceiling mounted Air Filter system.
If it's to be your only or first Dust Extraction system I'd certainly suggest otherwise, especially if you have space for something just a little larger, like the AWEDE2 Extractor or one of the next sizes up. Far quieter and expandable to a piped system around the workshop.