I got the Invective back up and running so I did a little a/b between that and the the SK. Clean: Both have excellent cleans, but they’re significantly different. I tested using both my Strandberg Fusion and my Fender John Mayer Strat. The Invective is darker and has more low end while the SK is a bit more percussive, stringy, and sparkly. I’d say the SK is a bit more toward a Fender style clean but not quite. I could see myself preferring one or the other depending on the day. At home the extra low end is nice but I suspect it would have to be managed for live use. Crunch: My ideal crunch channel is in Marshall territory. Here, the Invective comes up short while the SK excels. The Invective has more gain, even with the gain dialed back to around 9:30 and doesn’t clean up quite enough for me. Additionally the gain is a bit coarser sounding to my ear. Conversely, the SK has a smoother texture to the distortion and definitely makes me think JCM or hot rodded Marshall. It cleans up very well. While the cleans were close, I very much prefer the SK crunch. As a huge Tool fan, I think this channel is awesome for that (@t00lgasm) Adam Jones style stuff. I’m also a huge instrumental prog guy (think Plini, Sithu Aye, Widek, etc.) and I think the crunch would also be great for that. Lastly, the low end in the SK is alive and well in the crunch channel. Lead: Again, both are great. With high post gain settings, the Invective sounds just like my old 5150. The gain is coarse and grainy and awesomely brutal. The SK, while based on the 5150, seems a little smoother than the Invective. With that said, it too is awesomely brutal. I could hear that the 5150 is where it started and I can hear that they made some tweaks to that sound. They changed the character a bit, but the overall effect is intact: crushing high gain tone. Like the crunch channel there’s no lack of low end. Volume: The Invective is seriously easy to control when it comes to volume. Turn its master boost off and it’s easy to dial in bedroom levels. This is not the case with the SK—it has me seriously considering an attenuator. The SK is more like the old 5150 in this way. Once you turn up the pre gain where you want it (I’ve been keeping it between 10:00 and 2:00) the master becomes pretty touchy. And just as it gets to around 7:30ish (so right around 2/10) the amp really opens up. Of course that’s pretty loud. Not overly so, but it sure ain’t bedroom level. MIDI: Both are midi controllable, however the SK has just the barest of midi implementation. It accepts PC messages but doesn’t seem to use CC messages. This means you can bring up presets which sets the amp’s channel, focus on/off, loop on/off, and master 1/2. What you can’t do via midi is directly control a single thing such as turning off the loop. The inability to use CCs isn’t a problem for me but I could see that being an issue for some users. Build quality: I had both amps opened up. The SK looks to be super high quality; the Invective looks good but not on the same level. All in all, both amps are outstanding. If I absolutely had to get rid of one, I’d have to give up the Invective and keep the SK. Both have great cleans and leads, but the SK crunch is just far better for what I need. It’s possible swapping a 12AU7 into the Invective would help. I’ve tried that but it was a long time ago so I don’t remember too well lol. Which one is better for a certain person will probably come down to pure personal preference. Great amps.