I found Merlin's puzzle to be a quick fill and the final step was easy for me to complete - but that does not diminish my admiration for this excellent construction in the slightest. Some of the misprints were indeed hard to spot - I was sure there were editing errors on some of them until the PDMs occurred. Now I realize they are all quite sound. Well done, Merlin!
Agreed, TB69. Just finished it too - very much liked the three-way choice of devices. Approachable clues, leading to unambiguous endgame. Many thanks, Merlin.