Anyone use Crashplan?

I've been paying a couple of months for crashplan (month to month) and I quite like it. Being able to back up 700GB for 3$ a month is damn good value....

I'm about to take the plunge and buy the full 4 year subscription (it is such good value), but before I do., I was wondering if anybody had any more experience with it, as it is not a small amount of money to invest at one time... I love it so far, but is it too good to be true? Are there better alterternatives that I am missing out on?

Thanks in advance, guys!