I'm a Vonage customer and seriously revisiting matters. Meanwhile, a Bear Stearns research note has me wondering even more about Vonage's viability. And if I'm wondering perhaps other folks are too. These customer worries are a vicious cycle. Here's the cycle: Customers steer clear of Vonage due to concerns about its viability and patent uncertainty, the company can't grow, misses even more earnings targets, runs out of cash and dies.