20 Feb 2024
Unfortunately unusable for us. The audio guide requires a separate "redeem code", which is not included in anything Viator sends. In the instructions there's a line saying you have to email or call for the code. I ordered and emailed the night before a sunrise visit, and they didn't email back until 9am when we were already done.
There is basically no reason to buy this through Viator. It just adds a middle-man and complication. The vendor obviously is doing this as a sort of advertising mechanism, but it's not well implemented at all.
I can't comment on the quality of the guide itself since I never used it. Their email response time was reasonable, it just shouldn't have been necessary and was unexpected. It's a shame--they superficially seem like a nice company offering a reasonable product.