Does this have the FDX-10 first stage? If so, that's a great deal.
I have 3 Delta IVs and they are fantastic regulators. Also, as was mentioned earlier, Oceanic service is the best in the industry.
Yes. The Delta 4 is equipped with a FDX10 first stage and before the EOS came out it had the swivel hose. Once the EOS came out it got the swivel. This year Oceanic released the Delta 4.1 the changes are cosmetic and the price is higher than the Delta 4 yet lower than the EOS.