Customer reviews are essential to a product's rankings, but it's not always easy to get the quantity of reviews you want. The the best way to get a large number of reviews is to create an email outreach campaign to automatically ask users for a review.

Without the automated campaign I have running to get people to review my products GMass and Wordzen, I probably would have only 5% of the reviews I actually do have.

Even more importantly, GMass is ranked higher than its competitors in both the Chrome Web Store and the Gmail Add-on Store than other products that do mail merge in Gmail–even though some competitors have a significantly larger number of users. Why do they have more users than GMass when GMass is clearly superior? That's a story for another day, but mainly because they're the Silicon-valley big-money venture-capital-funded TechCrunch-type of companies...and GMass is organically grown, in the midwest, and focuses solely on its product and not all that other fluff. But I digress.