Our company is still a work in process, but we've got paying customers and 5 on 5 as average review of the product (http://apps.shopify.com/fanchimp), plus two seed rounds of funding.
Sentimentally we've been together for 7 years, working as co-founders for about 5 now. We're happy and we're focused long term.
I hope to have replied to your doubts. ;)