I was using PPC112 for years, but recently I've upgraded to this PPC212 (closed back, Made in England, 2x V30s) and I have to tell you that it is a huge step forward. This cabinet sounds so damn perfect in conjunction with my TH30 - loud, full, rich and focused tone which cuts through the band like butter.
I use this with a peavey 6505+ and it really works well! The practicality of a 2x12 for me is the storage and more space for transportation but I really wouldn't look to get the 4x12 when i've got this.
Being wider than the open back, this closed back version really does have more of a punch to it.
Also if you're not as keen on this because the 4x12 means that you you can hear it better and you think the 4x12 looks better just whack one of these on top of the flight case and see/hear it then ;)
The Orange PPC212 Open Back is an awesome cab. Built with thick plywood and loaded with a pair of Celestion Vintage 30s, I'd say it's an industry standard 2x12. At first it sounded a little harsh, but over time the breaking in of the V30s has proved to be good for the tone. I've used it with my Orange Dark Terror and Jet City 100HDM and they've both sounded good with the cab.
A great 2x12 fits well at the bottom of my massive orange fetish stack stock but 2 vintage 30 S in it, just to put it out there the 2x12 is ate the bottom then the 4x12 then the rockerverb 50 driving the 2x12 and then the or100 driving the 4x12