I just love the tool. I created a scenery in the north eastern part of Switzerland with default Corine and OSM data plus SRTM-1 data from http://www.viewfinderpanoramas.org/dem3.html.
Flightgear really can look great with a plausible scenery (latest Flightgear 2.9.x from GIT, Rembrandt, Random Buildings (default number), Random Vegetation (1.3)).
Churfirsten (https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=walensee&aq=&sll=37.0625,-95.677068&sspn=61.19447,129.638672&vpsrc=6&t=h&ie=UTF8&hq=&hnear=Walensee&ll=47.132987,9.298553&spn=0.104519,0.253201&z=13&iwloc=A direction NE):
Eschen, Fürstentum Liechtenstein (https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Eschen,+Liechtenstein&aq=0&oq=eschen&sll=47.220617,9.564972&sspn=0.104347,0.253201&vpsrc=6&t=h&ie=UTF8&hq=&hnear=Eschen,+Liechtenstein&ll=47.220034,9.526262&spn=0.026087,0.0633&z=15, direction NNE)
Säntis (http://en.wikipedia.org/wiki/S%C3%A4ntis, seen from West-North-West)
PS: In TerraGear Gui the label for 1 arc second on the "Elevation" tab should probably be renamed to "1 USA only (with a few exceptions)"
PPs: I have the same problem as psadro_gm with genapts850 on Windows 64bit