Yes Adam, thanks for pointing that out. However, just to clarify for Juan, said issue would not give bad values/results- it would just make those components non-quantifiable with this method. In his description, he is looking specifically for way to get volumes for "area templates" (which I assume he is referring to surface templates), in which case, while not impossible, I doubt highly that he is clipping these.
I will also add that I used to use Item Browser to set up a report to export to Excel, then grab geometry volumes and copy/paste into my report. But components published in SS3 I have had issues with using Item Browser with...
Long story short, I believe this workflow will suffice his needs to get quick values.