I am applying for postdocs and one of the offers I have received is from a university in Saudi Arabia. Although the research which they do at the University is good as far as I can tell and regularly gets into top-tier journals, I have been warned that doing a postdoc at a university in Saudi Arabia is perhaps not advisable, because although it is relatively to easy to go there, it can then be hard to return to Europe afterwards.
Is this a genuine effect which can happen or anyone with any experience of having studied at one of the universities and had trouble applying for jobs afterwards? Is it a ''black mark'' to have spent time at KAUST or a university like that, or are they reasonably well-regarded?
I have spoken to two people who are from nearby countries and they have suggested that this should be a last resort. Also I heard a story of someone who had articles in Proceedings of the National Academy of Sciences and was struggling to get a job in Europe after having done postdocs at Qatar.