A frank exchange of views is often no bad thing. However- rather than assume other builders opinions and experiences are wrong or made up or due to incompetance (or whatever), its as well to remember that, yes, peoples experiences with various products and techniques may differ. As James suggests, the views expressed in this thread arent mutually exclusive. Different builders may use different compressors in different implementations for instance. Hardly suprising that results may vary! If James says hes built successful and inexpensive machines based on the pneumatic system he describes, I take it for granted thats true. If thats his experience its not suprising hell recommend something similar to others. Its also perfectly reasonable (and useful) to sound a note of caution based on bad experiences with cheap compressors, but theres surely no need to insult the intelligence or abilities of another builder when expressing these views?