I have the GLM100C and really like it. The app just got updated actually, it's now called "MeasureOn" and finally has the layout tool for Andriod phones (previously only available for tablets).
I haven't used the documentation function much in the last year (syncing to phone), but it was very useful on previous projects where I could send subcontractors a pdf that had pictures of all the rooms and the measurements in it.
About the only negative I can say about it is that you can't adjust the precision, it always measures in 1/32. When framing and other rough work, it's a bit of a pain thinking in 32nd's, but for trim it's great