We just finished the last episode, after a bit of a delay in receiving it (it was lost in the mail, but Paul was a hero in resolving it, great customer service).
This whole series has been fantastic. The storyline is fun and well presented - and if it's cheesy or showing its low budget in spots, that only adds to the charm!
My wife and I play quite a few puzzle based games together, finding them to be of varying quality. Across the whole Family Secrets series, there's been only very few frustrations or rough spots - a remarkably high hit rate for this sort of game. A ton of variety on types and themes of puzzles too. The clever props, the different types of papers and envelopes, the tactile experience... So much thought and passion has gone into the entire production.
Overall we've been hugely impressed, and are looking forward to picking up the Shackleton series, and whatever Escape Mail does next :)