While the original question of “Should I buy” is rather leading, I’d say that for the time being the practical answer is no.
At this point the virtues and limits of Sublime Text have been pretty well hashed over. I agree with jbrooksuk that the negativity stems from jps’s lack of communication. The defenses – which I’ve seen here, and I’ve seen with TextMate back in its day, and also with MacRabbit’s languishing Espresso app – are frequently a mix of “would you rather have the developer working on the code, or in forums answering a bunch of questions” combined with, in so many words, “well, with all of you people being obnoxious and critical, it’s no wonder he doesn’t communicate.” And, you know, there’s some truth to both of those. But the bottom line is that some communication is essential. For all the shade thrown at BBEdit for being old and tired, it gets point releases regularly and developers frequently take the time to answer questions on the mailing list. And, of course, there are open source editors that have pretty active development communities around them.
I bought Sublime Text pretty shortly after it came out for the Mac, and I don’t regret it – but at the same time, it’s hard not to grit my teeth watching the same thing happen to it that happened to TextMate 2 back before it went open source. (Ironically, TM2 is under pretty active development these days.) I’m still rooting for ST3 to turn official, and I still think it’s worth trying it out. But realistically, I think there’s a non-zero chance that Atom is going to end up being a modern answer to Vim and Emacs; there’s all manner of things to kvetch about with Atom as it exists now, especially in terms of performance, but I don’t think that’s going to be the case indefinitely.