I have the 101 and regularly use it as an e-reader and havent found the weight a problem, its a very light tablet, perfect for comics, books and the web.
I have rooted my Archos using UrukDroid 0.7, this gives you more room for apps (1gb instead of the 238mb that I had before) and speeds the device up as it allows you to use the faster ext4 file system as well as enabling compcache.
I use Launcher pro instead of the stock launcher and have found that this helps keep the device running smoothly, I tried Zeam and found that was very fast, but its no longer being supported so I returned to LP.
The gen8 archos devices are great, but they arent that powerful, so dont expect to be able to run the most recent 3D games that are being released for tegra2 devices.