They were really the first to the retail market with a dropped name service. They only allow one person to sign up for a snap on a single name. With new entries in the market, they are not quite what they once were. They seem to have spent the last year concentrating on designing the Wait List Service (WLS) for Verisign, while competitors have outpaced them on drop catching success. To cover all bases, you almost need to use them all to get a name you really want. Even then there is no guarantee and you have maybe a 50% chance of getting it.
alternative services:
Namewinner.com
Pool.com
Dropwizard.com
Some less often but occasionally successful services:
Godaddy.com also has a service in their accounts
Expirefish.com
Enom.com has a service, but it can be pretty expensive.