I used the dongle for the past 8 months for all my Wii/ DS connectivity activity, and for about 25% of that time, there wasn't much activity. My connections would cut-off, I would have a hard time logging on. I troubleshooted the Dongle, it had superb conditions (15 feet from the Wii, good connections, etc.). I just assumed that Nintendo's network was overloaded.
Now with the Lan Adapter, everything is flawless. No disconnections. The weather channel is always updated. The Vote Channel has the updated question in the window. Everything is downloading a little faster.
Just thought I would post this because I have heard, in the past, other people having the same connectivity issues I had.