Bottlangs are inaccurate but that's not suprising since almost nobody flies in these far away places, and very few pilots from over here go anywhere. So the data doesn't get tested.
Jepp are now doing the Bottlang guides in electronic format, viewable in Jeppview 3.5. This is good; on a VFR trip to Greece a few years ago I carried ~ 20kg of the paper guides! Of course nothing beats IFR for lack of need to carry mountains of paper.
The standard solution for VFR charts for far away places is the UK ONC charts. These were last updated c. 1998 but are OK for terrain. They don't show CAS, for which you need to get the IFR charts.