Well, depends on your needs. If you add one of those MIDI controller boxes, it lives up to quite something else, the main downside possibly being that there's no dedicated dirt pedal to slap in front. The FX IMO are solid, switching is almost gapless and the autosave nature of the thing makes it an excellent live tool, at least as a backup.
I agree that it is an excellent device, I have two Ones and the OG Pedal. I think they are great for what they are and can do, and they do more now than when I get the first one.
The key to happiness with Tonex IMHO is to use it for what it is good at, and not try to make it into something it isn't. If you expect to replace a QC, Helix, Kemper, or Fractal unit with a Tonex One, you are probably going to be dissatisfied with the limitations of the hardware and software, unless your needs are simple or you are looking to simplify. It does amp captures really well, and it adds a bunch of other things that can allow it to be a great practice or backup solution. BUT, the more you ask of it, the more likely you will run into its limits and get frustrated.
Mongillo expressed concern about the usability of the One, and I think his concerns may be valid for him. 99% of the time, I am using my One in place of a vintage style tube amp with a single channel or no channel switching, and in that context it is very usable and has more effect and features than what it is replacing. If you are used to something more full featured, with at least a simple screen and menu system, the need to use a laptop for major changes, or the need for external control devices is definitely something to consider before buying.
All that said, with the group buy, I would think the One is a no brainer for someone who wants some of the content packs or other software.