Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
I Decided to give TopoSim a try. There was one island I wanted to fly around in far eastern Russia where the coast line was very different between my V3 with FTX Global vector and V4. Toposim made the terrain look much better but did not change the coast line, and the little airport I was creating with Airport Design Editor is now down in a canyon. There is a wide flat plane between where the coast line should be and where V4 thinks it should be.