I bought the Archos 705Wifi a few months ago and oh my god the screen is big! Of course the big screen takes away the portability which can be a problem, and let us get the problems out of the way: it is not right to charge extra for support for more file types. It is not right to charge extra for a web browser that should be included out of the box. To chrage 100$ for something that the box says it already can do (be a DVR) is ouright offensive. When you have bought allt of the extras you end up having paid over 500$ for the device and lastly the audio coming out of the earbuds is low. The volume must be set to the maximum level to hear anything.
BUT having said all that. This device is great. It is easy to use (although the user interface is a little outdated), the sound quality is great (just don't use the earbuds that come with the device), the video quality is great (yes it is possible to watch an entire movie with subtitle support without any problems), the internet connection works without a hitch, the wireless connection and streaming works like a dream! Plenty of space on the device (I got the 80 gig version and I have over 50 gig available with plenty of music and movies on the device).
Overall this device comes highly recommended. If only all the extras came with the device!