Don't buy this guide,
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This review is from: The Danube Cycle Way: Donaueschingen to Budapest (Cicerone International Cycling) (Paperback)
When you read about armed border guards it is quite clear that this guide is hopelessly out of date. Not so much with the main attractions as many of them are old churches.
There are many more cycle paths than the guide suggests - but the roads are still heavily pot holed in Hungary.