My first experience with using (ASTER) GDEM:

It is an excellent product (better than SRTM DEM) and easy to obtain
0% (0 votes)
It is an excellent product but difficult to obtain
5% (1 vote)
Positional accuracy is satisfactory, but resolution needs to be degraded
15% (3 votes)
Neither positional accuracy nor geomorphologic plausibility are satisfactory
30% (6 votes)
SRTM DEM is still more usefull
50% (10 votes)
Total votes: 20