currently i use low end android tablet as a desktop (yes a desktop!, with the mouse and keyboard and connected through a usb hub via OTG cable. this android tablet is has dual core 1.5ghz max ARM processor with 512mb ram, but it's miserable to use android as a desktop , what I do most : internet browsing(random browsing,youtube,facebook,gmail), Word/Powerpoint, some programming in python and watching movies. What makes it so horrible is the copy paste feature is a hit and miss also it doesnt support right click(i can hold left click to replace right click but seriously i have to hold it, i understand its designed for touch and all but...) yes you can multitask,but the alt tabbing is really poor(and if its out of memory it will just end other apps running in the background. I understand that the Raspberry PI model B 512mb has a single core and 1ghz max means it would be slower but would the full desktop functionality be worth it for the slight sacrifice in performance?