a little late but heres my review.
i've always been a big fan of falian and his offerings including dfb and more so recently the webinars hes been putting out. you can tell he knows his shit. when he brought siteflow to the market i decided to check it out and support a local VA native like myself.
siteflow by itself is very easy to use, all you do is plug in your url and g analytics api. it then spits out a report with insight on pages that have too much PR and pages that have too little PR and where to restructure so PR passes to the pages that could benefit it the most based on search volume.
my site is medium size and i did a pretty good job on structuring it a way that would flow PR from root -> category -> subcategory -> posts. what siteflow brought to my attention were many pages that had no real purpose (ie not built for monetizing) and stealing link juice.
falian also suggested that i dont do nofollow on internal links which i planned on doing and explained why. (you can learn why too if you got his newsletter).
all in all a good service that will make you rethink your internal linking for sure.