I've found it a little difficult to transfer files to my android phones with a mac. I also have other apple products, iPad, iPod Touch... (don't be a hater they make great stuff) Transferring files between them has been a logistics nightmare and I really don't like plugging in the usb connector every time I want a file off of my desktop or emailing it and hoping that it hasn't been resized by gmail. The only other app that accomplishes this is Evernote but it's not too great for photos. I've been using dropbox to transfer wallpapers and pdfs mostly. It works great across platforms! The android app allows for opening the file and directly setting your photos as wallpapers. How is everyone else using it?