Entrust - Identity Guard - Any experience?

[SB <vidyabalaji () gmail com>]

Hi!

I am looking for insights from you security professionals into
implementing a two factor option that does not require shipping a
token. Something similar to
http://www.entrust.com/identityguard/index.htm

has anyone had experience with this? Any known security issues with
this approach. This will be in addition to the person's user name and
password.

Thanks very much for your help.

Sri Balaji.