I received the heat+FX a few days ago and had some time with it. Maybe my experience can help others to figure out if it’s for them or not.

Tldr: it sounds great but it’s not fun to work with so I’m sending it back.

As mentioned before here, it is absolutely no problem to just plug in a guitar directly, it gets more than loud enough with input sensitivity set to max. The analog circuits mostly do a fine job of distorting the guitar signal, even though some sound less pleasing than I expected. I thought mid drive would be perfect for guitar, but it’s got a very unpleasant whine with the gain cranked. Round fuzz doesn’t sound like a regular fuzz, but more like a ring modulator, i kinda like it, but I wouldn’t know where to use such a guitar sound. I didn’t expect that, but high gain is my favourite circuit, as it covers a lot of sounds depending on where the gain is set. Saturation with the gain all the way up also sounds very nice. Putting an LFO on the high EQ sounds incredible, kind of like a harmonic tremolo. Putting an LFO on peak filter with a bit of frequency stereo spread makes a very cool phaser sound.
I knew the chorus, delay, and reverb from my time with the DN, and I like them all. Warble is also pretty cool. I thought the bit reduction could be used like a fuzz, but I don’t like what it’s doing to the guitar sound at all, it gets thin and scratchy, no matter where I put the drive and filter in the chain. Even though there’s lots of possibilities with all the LFO and envelope destinations, I feel like I already found those few cases that sound good and useful to me after a few days of using it. It’s easy to overdo it and create a wobbly mess, at least for guitar sounds.

The thing that absolutely kills the ah+fx for me is the user interface. It feels really obvious when I use it, that it’s basically an AHmkll, with the digital FX slapped on top, without considering the necessary hardware changes this addition would have required. Creating patches is just not fun. It’s mostly scrolling around with the navigation knob until you reach the screen/page you were looking for. And there are way too many screens due to the limitation of only having 4 endless encoders. Maybe this gets better with practice, but it’s a drag and feels like menu diving. The flow screen can also be used to jump into the different FX blocks, but it’s not much faster. A dedicated button to jump to each of the 8 FX slots would be really useful. As would be 8 encoders and the corresponding changes on the screen, and I would gladly sacrifice the EQ knobs to make the needed extra space.

It’s a bummer, as I’ve really been looking forward to using it, but when something is no fun to use, I don’t feel drawn to make music with it (but maybe I’m just really lazy or spoiled by great user interfaces eg op-1f and M8). I still think it’s great value for the money, but I’ll be sending it back and I’m hoping the hologram chroma console will fill the gap I intended the ah+FX for.

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