Got the MUSE. IMHO, if you have the Super AT Mod, you are not missing anything. I put one of my AT Mods next to it and dialed them in to sound the same. The knobs were close, this is probably tolerance of the pots. I then flipped the drive switch. It didn't have the effect that I thought it was gong to have. It actually thinned out the bottom end a bit and seemed to not have as much punch. It isn't as touch sensitive, which I expected. The difference is pretty subtle to be honest. If you don't have a Super AT Mod and wanted to get one, buy it. The AT sides are the same and sound the same.
I opened it up because I typically peel the serial number stickers off of Keeley pedals and then stick them to the inside of the cover plate. Everything in the pedal is surface mount. There is no ability to run a battery in them. There are two stacked boards in it. The screws were really freaking tight and hard to get out. The pedal size is bigger with the new enclosures. It has top jacks instead of the side jacks on the old enclosures.
I happened to have a Wampler Euphoria on the desk that also more recently purchased. I tried one of these quite a while ago and really disliked it. I had seen the video that Brian made on how to run it and why a lot of people have issues getting the sounds they like out of it. The video made a lot of sense and made me think not knowing how the pedal was designed was probably why I hated it. I didn't know how to run it. I was surprised at how much I really like this pedal now. Since the pedal was right there, why not compare it. Well, this kind of pains me to say since I have 2 Super AT Mod pedals and now the MUSE, I was able to duplicate every sound in both the Keeley pedals with the Euphoria and in many of the cases I liked the Euphoria better....