I've been using Virtual Post Mail [0] for about 2 years, it has been excellent. It's a bit more expensive and the implementation is different but the end result is similar.
I'm another VPM customer, for a little over a year. I like it and I plan to continue using it, but the website is definitely a little clunky and could use a redesign. Still, it's better than all the competing services (at least as of a year ago when I did my research).
This service makes so much more sense than Outbox. Easy to scale, allow you to mask your real address, relatively cost-efficient, allows people outside of the US to have a US address...
Anyone know a similar service that has an address in the east coast, preferably NYC, Boston and/or Massachusetts?
Another happy customer of Virtual Post Mail since 2009. Great service, great team!
I've also been using VPM for about one and a half years and it's been great.