Reliability with Zeos6.6.4 and Firebird

[elechos]

Hi!
I'm going to develop a commercial program with Zeos6.6.4 and Firebird2.1, in Delphi7.
Could anyone tell me the reliability of this Zeos6.6.4 for access Firebird2.1 database?
And if anybody has some info about the performance between Zeos and other component(FibPlus,IBObject,IBX,something else)
please tell me.

Thanks!