I get a annoyed with apps and services in perpetual beta ... a month or two is long enough to test your software and make changes; 5 years is ridiculous. If the general public are using it, it's not a beta, it's a product.
For a while there, beta meant new and fresh, now it seems to me to be nothing more than a cheap disclaimer. "Something go wrong? That's fine, we're still in beta." \
Many may disagree, but that's my 2c.