Having used the software now for about 3 weeks, I can say without a doubt, that SourceMogul has saved me days of frustrated searching for the products I'm looking for. Many new products have come to light that I would never have found on my own.
A very useful feature are the filters, which can be quickly set by myself to only include products with min ROI, Max BSR and actual profit. All the fee, size and weight data are available with a single click too.
The speed of the searches is impressive with most sites finishing within an hour or so. Also, no need to wait while it does finish, as you can view the incoming results as they happen.
In the world of online arbitrage, SourceMogul is a game changer for me.