All the negative input concerning Delta customer service and parts availability is very disconcerting.
I equipped my shop during the 90's and practically all my machines are Delta: Unisaw, DJ-15, DC-380, 17" DP, 14" BS and several bench-top machines. They have all served me quite well. The only stationary machines I'd like to "upgrade" would be the DP and BS.
I recall usenet discussions at the time always talking about Delta's superior availability of parts as a primary reason to choose Delta. People would often cite the availability of parts for 40-year old machines. I suppose no one can predict which of today's manufacturers will continue to support their products in 10, 20 or 40 years.