Some people say HVLP turbine-based systems are great, some favor HVLP guns run by a compressor. I understand the advantage of the warm air (no condensation) supplied by a turbine, but I have also heard that turbines don't last very long.
The only reason to use a turbine HVLP system is for portability for on-site work.
As for air-driven HVLP, you better have a HUGE compressor.
Compressor sprayers will heat up if used on large jobs and cause premature failure. Otherwise both sprayers work well if used under the right conditions for each sprayer.
I know of a couple of great conversion guns that need only 4 to 6 cfm at 20 to 30 psi. These are very efficient, portable guns.
I also use a turbine system. The 40-foot hose is not possible for me because I only have a three-stage turbine.
There are benefits and liabilities to each system. The conversion guns that I have alluded to seem to offer more versatility for a finisher because a compressor.
The biggest drawback of the turbine is the fluid pressure in the cup. It's minimal, and spraying large pieces of material is difficult since the far egde of the material is drying and the near edge is still being sprayed, causing a rough finish due to overspray. It helps if you can increase the fluid pressure and get more juice on the material faster for a good, uniform, wet coat.
Today I rented an Accuspray 240 HVLP turbine system, and sprayed an oil-based black enamel through it. It worked great, but if I'm going to spend that much money, I think I would lean toward a compressor running an HVLP gun, mainly for the versatility of having a compressor, and because I don't need portability.
You can place a fan next to the turbine to circulate the air. I am on my second motor in the past six months. Luckily, Grainger has good customer service. The 3-stage motors retail for $127. I am getting good at replacing the motors; it takes about 1.5 hrs.
I don't like the large O.D. turbine hose or the heat given off. Binks has a LVLP line of air caps for their HVLP guns that start off with the 90P air cap that is designed to work with a 1.5 HP compressor.