SomeoneEsle123

It manages the prebuilt binaries...but requires being run as root or adding myself to the list of Nix trustedUsers...on an OS level.

Both of those things are scary and dangerous. I don't know what your software or Cachix is doing.

Can you tell me exactly what it will be doing to my system? What changes? Does it use a lot of disk space? Is it easy to undo? And is there anyone who recommends doing it who isn't associated to IHP?

IHP seems great, but I found it very hard to work with.

The guide said it takes 15 minutes to build initially...it took my laptop 1 1/2 hours. And I didn't use cachix (no idea what it was, didn't want it to mess with my system) so after a nix-gc I had to build again...

And the pro version costs $300/year, and goes up to $1500/year if you make $20k. That might be good for a huge company, but if that's a side project or a solo dev's income, that's way too expensive.