Bought Fathom Synth a couple of years ago when it was on sale without knowing much about it at the time. In terms of sound quality that has paid dividends. It's potentially fairly user friendly for beginners if just starting with oscilators and filters etc. but it's real strength is when some of the sound designers can go really deep with modulation and complexity, and this is currently beyond my own limits. But that's fine, there are a number of great sounding presets, and more available to purchase from sound designers too. The developer is very involved and open with the community on KVR here, and while he has a definite vision for Fathom, he also takes customer/user feedback on board too.
My only real request would be if there were more beginner tutorials explaining what some of the more advanced modues do, but with examples of sounds, not just the manuals description in words. I expect that will come, but I don't think Fathom has a large team working on development, marketing etc. so Everett has been focusing on improving the synth itself first. Quality over marketing b.s.
Many of the included presets have a very clean, pure sound. I hope future updates can add a bit more variety, grunge and snarl to the range of presets to show off Fathoms full range even more.
Everetts videos (Mountain Climber in particular for me) show just how amazing Fathom can sound, but a few more tutorial videos might help to open it up to new users better too.
I have been using Fathom for only a few months now. I started on version 1.0.7. At this point it is up to 1.0.11. It has a bucket load of features but a few that really grab me are the extremely powerfull envelopes and the built in delay. You can not only draw your envelopes but can double, triple............ and so on giving you a sequencer type feel. The delay is a three headed monster giving you COMPLETE control over left, right and center. This synth is capable of just about everything out there with alot of stuff we havent seen. I can see this being used alot for evolving soundscapes and one finger rhythmic dances. At this point it has a firm direction, is stable and a pleasure to program. Looking forward to the finer details.