Their 2 TB plan (currently $52.12/year; normally $69.50) seems good enough for what I currently do with CrashPlan Home.
Their 5 TB plan (currently $74.20/year; normally $99.50) seems good enough to even backup multiple systems (for which I was considering the SpiderOak One Unlimited for $179/year).
Check out the comments to the iDrive review on PCmag - a few unhappy customers, including one who says it took a month to perform a restore. Lots of people there saying, ‘Beware.’
Amazon used to sell it and you can still see the quite-middling reviews of it here: