The benefit is less mess, increased production, no disturbing from scraping and of course frequent refilling of the tank (If you are using canned butane it is still worth it cost wise). I've found it to be much more efficient then the scraping and full recovery that we are familiar with. Put the pyrex in the vacuum oven/chamber and finish as you wish.
In what sense are you seeing increasing production? When I do this the yield is lower, presumably because of the waxes that are being ditched. For me, every step is slower without heat, so I use the pour method for primo runs only.