The per computer thing made me move to iDrive but I will move back for the UX. I am going to do a hybrid where one computer is backed up with the majority of files, and for other computers use free Dropbox tiers.
Depending on which service from iDrive you use, the total lack of deduplication with its personal backup service was a complete no-go for me. If you can't dedupe, any changes to your folder names or locations provoke a whole new upload cycle, which is absurd.