Yes i have been in the last Jnue- August/ 2008 for Research from Norwegian University of Science and Technology, NTNU on Migratory birds.Ii is an amazing area of Biodiversity, endemisim, and Home of hundreds of Migratory birds from ever part of the world. Not only that the rift valley of Ethiopia is almost full with lots of ecolodges that make mental rest. But the park is really disappointing it is under sever destruction both by animals, agriculture,sand and mineral salt extraction from the lakes off-shore! for more details contact me!