I recently replaced my 802.11a access point and laptop adapter with 802.11n stuff:
Trendnet access point, TEW630-APB
Linksys laptop adapter card, WPC600N
Almost all is well: connection speeds that used to top out at 54Mbps with 802.11a are now ranging from 100-280Mbps (my general web surfing seems to bear this out) and I'm not losing the connection like I frequently did. So mostly I was a happy customer, until I tried viewing a video on youtube, which should have come in faster than before. On the contrary, while I could watch youtube videos with my old setup, they are now unwatchably slow: a video will play 1-2 seconds, then load for 30 seconds, play 1-2 seconds, load 30 seconds, and will keep going this way indefinitely.
I shouldn't be getting any interference from my wireless phones; they're 5.8GHz and my access point is using 2.4GHz. Also, I didn't see any relevant settings for this problem on either the access point or the adapter, though I may have missed something ...
Any suggestions are most welcome!