FWIW I am a long time ORBX user for OZ but due to internet data restrictions where I am (We are restricted to a wireless modem or portable dongle) have been unable to consider the ORBX NZ stuff yet.
So, IN the meantime I did a complete rebuild of my FSX scenery library following some good advice in some other forums which basically was to put outside FSX all your scenery except the FSX default. I found that fixed a lot of issues I had with scenery installations, conflicts etc and that FSX works much better with this sort of arrangement, including the correct layering as per advice contained in the FSX SDK. I then came across the ASTER GEM 30 M MESH at SimAviation.com, which is basically available so far for the entire world barring a few notable exceptions and you can download it in chunks for most areas. NZ is included as a separate download as is the Pacific etc. The ASTER MESH is a significant improvement on the stock FSX mesh and I am not sure you can get better for scenery unless you go to a very specialised product for your desired operational area. I then installed to enhancements by a chap called LeClerq which changes the interzone bgls in FSX for the transistion between bare land and mountains and the rocks in mountains, those enhancement also made a significant difference to the Scenery in FSX, both operate at the 50cm threshold in FSX (These came from FlightSim.com) . So then I added in lots of the fantastic freeware for NZ especially the Godzone and other freely available stuff. I am very impressed with the outcome and it all works beautifully using the ORBX scenery default FSX setting guidelines, frame rates are good without stutters on a bog standard HP Pavilion with 4G RAM and 2.8 Ghz CPU. Runs Captain Sim stuff very well.
Now I am not sure whether to even bother going the ORBX route. Anyhow for those interested the above is a very good alternative route to really picking up the scenery graphics in FSX. Oh, yeah did take a lot of time, but worth it.
