Pros: Gigabit switch. Pretty flexible router/firewall configuration. Gamer friendly. Handles lots of simultaneous connections.

Cons: Nothing too serious... Lacks configuration options of a full firewall.. but that's expected (see below).

Overall Review: I've been using this for 3+ years, playing online games, running torrents, streaming vids, etc.. It also serves as my main home ethernet switch. Great performance all around. My main technical complaint is that its firewall does not allow ICMP packets outbound, even legitimate ones. For example, outgoing Destination Unreachable packets from my torrent machine get blocked by the DGL-4100 when I shut down my client/tracker, which causes other hosts in the swarm to continuously try to reconnect for me for hours since they can't be informed that I'm no longer running the torrent. I can't blame D-Link for this, as "conventional wisdom" is that all ICMP is a security risk -- but in reality, some of it is very important for keeping the network flowing smoothly. ANYWAY, this is a great router/firewall box ... it doesn't have the configurablity of a full-blown firewall, but I think it's perfect for home use, and it performs well.