Let's say I only stumble the front page of a site, many many many times (by different people of course) You know how people say they get "spikes"? Does this happen with my site? For example, the first day I stumbled many times, i got 300 visits. The second day, stumbled MUCH MORE times, ~15 visits. will this ever shoot up again, if i keep stumbling the same site over and over?
When I stumbled my website I got a ton of traffic all day. The traffic that you will get is not very targeted. You Should definitely stumble your website and possible even write a review. Another backlink never hurts. I would recommend adding "AddThis" button to your site so other people can stumble your website among many other bookmarking services.