Yep the RM ones do have a good battery life if you manage the charging when they need it. I have them in several schools and have a simple paper chart inside the trolly door that people fill in thier rough usage and then somebody recharges at 3 1/2 hrs. 2 sets ate over 2 yrs old and batterys are still good. I force the internal cards to 801.1a rather them g (rest of teachers laptops on that) and ensure the trolly is plugged in to the network near the laptops use. I use 2 Dlink waps on each trolly and only have the odd laptop drop off when everydody logs into domain at once. I found that the avarage bandwidth on 801a much better the n g or super g when it comes to many laptops in one place.
Yes they cost but if i can find out a replacement asus unit that is similar speced i shall use.
Wish i could use cheeper but havnt found a better solution with low overhead yet:)
