I've been using Sync.com for the past year. They've been sort of in beta but releasing features. 5GB free.
SpiderOak is decent but they recently dropped their free plan, so not sure what's going on there.
MEGA was great but Kim.com said last week in Wired that the company is run by criminals
Tresorit is good but expensive. Maybe that's why they've been around so long.
Bitcasa pulled a Wuala last year and closed down their consumer cloud storage after a lawsuit. That's pretty much it.
There's OwnCloud which is do it yourself. And BitTorrent Sync which is kind of do it yourself but they've been adjusting pricing so it's bait and switch as well.