I have downloaded files with aTorrent (sgs3, ics) in the background while doing other things like www browsing and photo shooting on the foreground. Multitasking or "multitasking" is no issue in high end Android phones for practical things.

To succeed really, for example right now, JollaMeego should be installable to the top end smartphones like sgs3. Because Android will continue to be more open and better "real multitasking" OS, (if) with inferior hardware specs, Jolla-phones may not make it. Samsung prolly will bring Tizen installable to its high end Android phones eventually.