I just went back to DropBox because the solutions I have bundled with services from work (iCloud, gDocs and OneNote) just aren't as seamless as DropBox. Dropbox can do a round trip to MS Office docs better than even OneNote (just click on the edit icon in Dropbox) and for PDFs, you can do a round trip to Adobe Acrobat in the same way -- it feels pretty close to editing files from the Finder on the desktop. And then there are all the other apps that sync files with Dropbox effortlessly, such as PDF Expert, which I use for reviewing journal articles (I just like it more than Adobe Acrobat). Managing files are also easier in the Dropbox app compared to the apps for iCloud, OneNote and gDocs. You'd think we could be free of Dropbox by now, with all of the competition, but I find every other service too fiddly.