Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
I have used PCLinuxOS since version .8 and have always found it easy to use and aesthetically appealing. Being based on Mandriva might help PCLinuxOS' cause as Mandriva has been and continues to be a system new Linux users can migrate to with little to no learning curve.
However, just because PCLOS is based on Mandriva does not mean that Texstar, et. al, does not take the time to fix up any buggy code and add features to what becomes PCLinuxOS. In fact, it is this writer's belief and the beliefs of many others that PCLOS in it's beta form is more stable than other distributions upon their official releases - including those of Mandriva's. But you don't have to take my word for it, just go check out the Distrowatch main page and look on the right hand side of the screen that says "Page Hit Ranking". Basically, what I'm saying is this: PCLinuxOS got to be as popular and as stable as it is on it's own merits. Don't let all this "based" stuff fool you or mislead you.
As I've stated above, I have followed PCLOS since version .8, or since approximately 2004. This newest release, dubbed "2007" is the release that immediately follows the .93 releases. The main differences between the 2007 and the .xx series is that 2007 has new underlying code that is incompatible with those previous releases. What this means is that, once installed, PCLOS can be updated and upgraded in the "rolling" fashion as it was before, much like Arch Linux, Slackware, Debian, Gentoo, and FreeBSD, just to name a few (in other words, install once and then update).
PCLOS in Action