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In page Expedition to the Barrier Peaks:

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In the August 1981 edition of White Dwarf (Issue #26), Marcus L. Rowland said in that he found the adventure "very enjoyable, with ideas and creatures eminently suitable for wider use". He gave it 9/10 overall, but complained that some of the maps were printed on both sides of the same sheet, making them useless as a Dungeon Master's shield[20] (a visual barrier that allows dice rolls and other activities to be conducted without the players knowing the outcome.[21])He recommended at least a week's study by the Dungeon Master before attempting to play it. He also noted that the cover "reveals the secret of the creatures".[20]