First of all it's a bit misleading to say there's 20 profiles in this pack. Yes, there are...but only because there's studio and merged versions of each of the distinct settings captured. 6 of those are geared towards the Petrucci sound - 2 cleans, 2 crunches, and 2 leads. Only the 2 leads have the gain that Petrucci uses 90% of the time. These are the profiles I tried the most, so I'm really only reviewing those two sounds.
First of all, this pack sounds very dull. I immediately had to boost up the treble and presence to get back in the "normal" sounding ballpark. You can hear this in the demo clips. Compared to the Mark V and pretty much any other Top Jimi clips, you'll notice this amp sounds quite dull. That's not a huge issue, so long as boosting the high end back up doesn't yield a lifeless sound. In my experience that's rarely the case with a Kemper profile, so long as you don't have to go too far. I'd say its certainly manageable here, although if you're looking for a bright, modern, thrashy metal tone, I would not recommend this pack. This seems geared more towards the modern Petrucci lead and rhythm tones (as you should expect).
The first lead is more fat and open-sounding. I wouldn't use it as a rhythm tone - too loose on the low end. But it really nails the creamy Petrucci leads. Only tweaking I needed to do was add treble and presence. I really like this profile and easily feel it will compete with other killer lead profiles in this vein. It's very responsive and feels lively. The notes bloom. It's got a squeak of vintage nasally-ness but also sounds modern. This is the quintessential Mark IIC+ tone. I used to own a Quad preamp and 2:95 - this sounds very similar.
The second lead tone is sharper and tighter. Not sure if this is shred mode, but it wouldn't surprise me; as I don't remember being able to get my rig this tight. Again, dull until you boost up the treble and presence. I went a step further and added a Studio EQ to cut about 2.5db at 650 HZ - there's a ton of mids here, more than I feel Petrucci uses, at least for a rhythm tone. Even after, this isn't going to deliver a great modern metal tone. But it does a good job for a Petrucci rhythm. It's best at a tighter Petrucci lead where the notes need more attack and maybe there's some palm muting involved. It's not as open and lively as the first lead and I feel there's something missing, but I think it would sound better louder or in a mix.
Overall, I'm a bit mixed on the pack. I hate to buy a commercial pack and have to immediately tweak. I would have liked some more high-gain tones between the two Petrucci leads. I wish there were profiles that captured sounds other than the darker Petrucci sound (Metallica style thrash for instance). Still, there aren't a ton of profiles of this amp, and that first lead really nails the creamy Petrucci lead sound. I can probably tweak those two profiles into other variations, or switch cabs for more radically different sounds. Normally, I'm immediately pleased with a Top Jimi pack, so this one leaves a bad taste initially; especially since this amp is exactly what I want from my Kemper. But I don't want to push away potential purchasers. It's by no means bad, but doesn't hit the mark I had my hopes set on.