Don't own a Promod. Never have...
That said, I have 2 Quickrods. One is a '06 and one I just got, it's a 2013 with B+ option.
These are TOTALLY different amps!! Both are awesome in their own ways.
I do like both and definitely enjoy the effects loop and the mode button on the footswitch of the 2013 more.
The loop on the '06 is useless, never use it and the adjustable volume on the loop of the 2013 makes it very nice.
The '06 has something different...aggressive is a good word. I feel the VH tones oozing from this amp. Mode 1, gain at about 12-1pm HOLY SH*TBALLS!!
Yes, not a very forgiving amp. You play it, you hear it...ALL. Once you get used to what it demands, it is fantastic and offers good distorted tones along the spectrum.
Not a great clean, more a clean w/ break-up, like a fendery-type thing.
The B+ option changes things. It is a different animal AND as was mentioned, the later models have some changes.
The loop has a Master, footswitch has a mode button (previously you couldn't change modes other than manually), the clean channel is GREATLY improved.
I will suggest you try BOTH if you can. There is more to hear and it will take playing through the heads with the same cab to get a sense of the way they each behave.
I would consider running them together, because they are different and the same as well...hmmm, I gotta try that.
Good luck...You could always call Splawn directly. Scott is a great guy to deal with and he makes killer amps and cabs at reasonable prices.
I hear great things about his cabs, although I don't own any currently.