I have a 3835 and love it, but I may be one of the lucky ones. There are quite a number of known problems with it. I occasionally get the "light won't turn on" issue, but I just soft reset and it works fine.
I am having a problem with getting it to charge, I think the cradle may be screwed up though.
Overall, I've been pretty happy with it, but I had fewer problems with my old Palm V. On the other hand, the iPaq does a heck of a lot more too.
I get a lot of information from http://www.brighthand.com
. Both of them have really good forums for getting more information.