I’ve just looked up GC28Q1K and it does appear to be a superb cache. However, it’s only ever been found 9 times and not at all in the last 16 months (doesn’t that qualify it for something!) It seems to me that if you are going to create a really good physical cache, it’s rather counter productive to make the puzzle too difficult as too few people will experience the delights (or otherwise) of your work.
