I'm debating a return to Simplenote. I used this service a few years ago until they lost a whole bunch of my notes. Since then I've been using a combination of Dropbox iOS text editors (notably Nebulous Notes, Notesy and Byword) and Drafts.
Drafts uses Simperium as its sync service, and Simperium is produced by Simplenote. I have found Simperium to be reliable. I use Drafts on an iPhone and an iPad and have never lost a note. Now that Simplenote has been acquired by Automattic, I have been looking at the product again. I trust WordPress, and I trust Matt Mullenweg.
Of course, trust means many things. I trust the ethos of Automattic, I trust the stability of their cloud (I pay them for VaultPress to backup my Sasstrology blog), I don't know if I trust them in the "create a backdoor for the NSA" sense, although I would like to believe that they are the kinds of people who would put up a fight.
I am not keen on using a notes service in which I do not control my data. With a self-hosted WordPress solution, my blog contents sits in a database on my own webhost. With Fargo, my OPML files are stored in a Dropbox folder on my hard drive. Same for the Dropbox iOS text editors. And I only store stuff on iCloud that I am not too attached to.
Simplenote does have various export options, but that's not the same as having the data stored on something that I own (or rent, in the case of web hosting). Although Simplenote uses the same sync service as Drafts, the latter is meant as a temporary holding bay for ideas that will be sent to other applications, whereas Simplenote is for archiving text notes.
I suppose my decision may come down to the user experience. I've read that Simplenote is blazing fast. Is it better than any of the Dropbox iOS text editors that I use?
I will report back when I have an answer.