I've mentioned this elsewhere, having finally found the Season 4 box set in the local CEX, after it somehow managed to bypass the chaos that is HMV and Smiths.
It is, precisely, what it is - and what it is bleeds joy. It's a callback to the sheer dumb fun of movies and shows we remember from the 70's and 80's, when they were good, and is the only current show I can think of that genuinely celebrates male friendship without undercutting it with irony and hidden condemnation. It's a couple of guys arseing around and cracking each other up, and if you have a problem with the occasional Boob Joke, to the point where you can't forgive it, then you're dead to me.
The box sets are worth the price simply for the commentaries. There are lots of em, and everybody involved piles in to contribute and keep on cracking each other up. They love what they're doing, have the time of their lives doing it (freezing their arses off in Toronto notwithstanding) and just want to share the fun.
Psych is, simply, the most value and fun you can have for the ten quid or whatever you spend on a box set. It's fortunate that they're so cheap - but positively criminal that the show seems to be so underrated. Shawn should investigate that, along with his trusty sidekick, Ghee Buttersnaps.