Nope, I stick with what I said (with the exception of 'loads of airtime' - there's definitely a fair bit, more than Thirteen - but 'loads' is perhaps a little OTT).
The theming within the drop zone is completely, truly dire - it's the inside of the rockwork, which should never be seen. The section after the drop is also poor - thirteen post-drop beats it hands-down. It could also be argued that the theming on the rest of the coaster is so-so, perhaps Thirteen is better (though off-ride Polar-xplorer's theming is very good). The drop is also shorter than Thirteen.
That's the bad stuff. The other side of the coin is this: the pre-drop section completely beats Thirteen's. It's forceful, fun, and with pops of fun, floaty airtime - all of that in contrast to Thirteen. Also feels like it lasts longer. As for the drop, it really is surprisingly forceful, again, much moreso than Thirteen's. It feels more towards Oblivion to be honest (slightly - perhaps that's a bit of an exaggeration) - much more like you're strapped to a very large device (which you are) which just falls. It's over too quickly, but if you made it taller (like Verbolten), it'd be excellent. I personally prefer it to Thirteen's, but then Thirteen's has the benefit of length and the mini-drop.
There's no denying that in some ways Thirteen beats PX hands down, but overall, I much prefer PX as a complete package.
(Free WiFi in the hotel FTW, writing a long post on an iPhone FTL...)