I've had the Mark V 35 head for about 5 months now. It's a pretty incredible amp but in my experience for studio work at least it's not easy to dial in 'right' (whatever that means for me haha). However, once you hit the sweet spot it sounds really good! I have a couple of observations about this amp (and this will also transfer to the Mark V 25 and likely also the 90w version). What I've noticed is that the tapers of the pots react a little differently than I was expecting. When I first got the amp I dialed in my sounds just like some of my heroes like Petrucci etc. This meant, lower the bass and mids and raise the treble. All to get that tight and aggressive (flubless) high gain sound. I would also dial in the graphic EQ to a quite drastic scoop. It sounded alright but in my mixes it always ended up a little too harsh. I have to admit that I was dialing this amp in too much with my eyes instead of my ears, so I definitely fell into that trap! Then I read a post on the Fractal forum where Cliff from Fractal mentioned that the tapers of the pots in the Mark V a very different from the Mark IV for instance and that that could cause a percieved lack of low-end. So I started to do more experimenting and my tones really improved. I raised the bass control to get some beef and body back into my tone, I lowered the treble a bit, raised the mids (although this control is the most subtle on channel 2 with high gain) and I also adjusted the graphic eq settings by scooping less heavily and also by lowering the bass and treble sliders a bit. Now my sound is way more beefy and full, much better! You can hear these new settings in this new video: I guess the lesson here is to not dial in amps with your ears and force yourself to listen more. This is especially true with amps that have many variables and controls that have a huge impact on the sound. For instance my Orange lunchbox amps are much easier to dial in because most of the controls act way less drastically than the controls on my Mark V. So if you want a very easy amp perhaps the Mark V isn't the best option. Amps like the Oranges or EVH's are much easier to dial in. All of this is just my opinion though. Now we got that out of the way, I would love to know what settings you guys like to use for your Mark V's! Also tell us what guitars you're using the settings with because that obviously also makes a huge difference.