I originally had a B50, then had 4 warranty replacements, the last two of which were B60s. My current B60, the last warranty replacement, has been working fine for nearly 2 years. I think maybe they worked out some of the reliability issues and improved the machine -- this B60 definitely has some changes from the B60 that preceeded it so they did make changes to it.
That being said, I will tell you that those 4 warranty replacements cost me absolutely nothing, and each time they shipped me out a new machine immediately -- they didn't make me send in the old one first so there was no delay. They definitely stood behind their 1 year warranty. Not only that, for each replacement the one year warranty period started over again. Also, the Green Mountain site offers some sort of free extended warranty on your machine if you order enough coffee from their cafe express program: http://www.singleservecoffee.com/archives/025743.php
As for trying it out, one thought is that many car dealerships now have keurig machines in their service areas, as well as lots of other businesses. My current and previous hair salons both have one. If you keep your eyes open, you can spot them in many places. Also, if you decide to just go for it and you buy it from BB&B or Target, you will have no problem returning it if you don't like the coffee.