Tough question...I am of the opinion of keep them both... lol I had one on pre-order from breazy which i am still waiting on, but got two from ecig avenue....so gonna have the black, silver, and blue. I am a bit of a gear whore and have a serious online shopping problem when it comes to vaping!
I don't see why the fix wouldn't hold. Maybe try taking batteries out and reinstalling, see if it stays the same? It is likely something that a firmware upgrade should resolve as well, and if there are numerous units like your's I cannot imagine it will take them long to address.
I am just hoping to see the sx pure atty soon, as it sounds pretty cool and will certainly be nice to play with those settings!
Let us know what you decide