I don't think that we should be asking for help on them or getting help on them. If they are asking for specifics for that one, but maybe a general tips for working on puzzle caches might be helpful as a topic.
I don't see a problem with "Dude, this is an awsome/diffcult puzzle cache. You should try and solve it." Now, if only my html was better I'd link to the one I'm working on right now that is awsome (you need an Enigma machine to solve it).