I've been potching recently with a Raspberry Pi 2. It's a promising little board, especially because of its GPIO header. Despite the quad-core processor, it's probably not going to replace my (ancient) work desktop. It boots NetBSD/evbarm and seems to run X11 nicely but the big challenge is storage speed: I'm using it with a microSDHC card that reads at 16 MB/S but only writes at 3 MB/S. A USB flash drive turned out to be even slower. Because my Raspberry Pi only has 1 GB of RAM, any large application is likely to swap and then everything grinds to a halt. That said, rdesktop seems to work nicely so it's plausible as a graphical terminal, despite the 100M Ethernet port.