I'm using the Sub n Up and to me it's a wild horse that you have to tame to appreciate. The four pots (and the three way switch) can be very responsive to subtle changes. There is so much that you can get from it that it can be intimidating but once you settle in and get comfortable and start to learn what cause and effect it can create it's a very good octave pedal.
Tracking is excellent IMO on the non tone print settings. Most of the tone prints on this pedal are so far a novelty. Some are just plain awful and the tracking goes way south. I do appreciate a lot of the tone prints on my tc chorus though. YMMV.
That said, I placed mine in front of a Two Notes Le Bass (an absolute keeper) and it changes EVERYTHING. Mixing with other pedals can make a mud pie quickly. Might just be my set up atm, or most likely my inexperience as well.
As I mentioned earlier, in my opinion, the more subtle the use, the better this pedal will add to your tone. I would definitely buy it again in a heartbeat.
One more thing. the up octave is not hard to miss. I can see using it a lot. It can be pretty crisp and present if you want when dialed in and if you like sub 2 on this pedal and go deep, you'd better have a great cab that has a pair . . . of great speakers.
Deak