I've used Sublime for a number of years now and have recently (over the past few weeks) been making a concerted effort to use Atom as my daily driver (mostly because I appreciate the open source nature of it and am familiar with Node). My experience thus far has been good. I use a Windows machine and half a year ago Atom was practically unusable; it's come a long way since and now I'm comfortable using it as my main editor.
I do notice the occasional performance hiccup -- I'll try jumping through settings and the application will hang for 20-30 seconds. I would say this happens probably 1-2 times per day. Other than that I don't really have any complaints. The package/theme community is vibrant and updates/improvements arrive frequently. Sublime is still a more stable and capable application, but given Atom isn't even at a 1.0 release I think that's acceptable. I think it's only a matter of time before Atom overtakes Sublime in terms of stability and performance -- the current velocity of V8, Node and Electron have it well on its way.
I do notice the occasional performance hiccup -- I'll try jumping through settings and the application will hang for 20-30 seconds. I would say this happens probably 1-2 times per day. Other than that I don't really have any complaints. The package/theme community is vibrant and updates/improvements arrive frequently. Sublime is still a more stable and capable application, but given Atom isn't even at a 1.0 release I think that's acceptable. I think it's only a matter of time before Atom overtakes Sublime in terms of stability and performance -- the current velocity of V8, Node and Electron have it well on its way.