[wvugrrrl]

DBF and I have stayed at Pop Century 5 times in the past: March & October 2004, March 2005, August 2006, and March 2007.

I'll be honest - we mainly stayed at Pop Century because it was cheap. Since we've joined the DVC, obviously we won't have to do this anymore, but I will say that I'll always have a special place in my heart for the POP!
The theming is absolutely amazing. Each decade is very well-represented, from the enormous icons, the stairwells, and pools, to the inside of your rooms and the wall art hung there. The main lobby is definitely a treat to look at during check-in, or visits to the cafeteria, especially with all the decade-specific theming.
We have stayed in the 50's, 80's, and 70's sections. I have to say that I enjoyed the 80's and 70's sections the most, mainly because they're not as close to the busy lobby and even busier Hippy Dippy Pool. Therefore, they seem to be a little more peaceful...but they are a bit of a hike to the shuttle and lobby areas.
As far as your rooms - they're not very big; the beds aren't the most comfortable, and the walls are kinda thin...but, for an average price of $80 a night, you can't complain too much.