[Dovecot] Dovecot Versions and Debian

If you want to run Dovecot on Debian Lenny for a Production System (with Fast Upgrade System for Security Patches), What would you recommend? Stick to the current port with Dovecot Version 1.0.15 (1:1.0.15-2.3) Use Backports Version 1.1.13 (1:1.1.13-2~bpo50+1)

or Use any of the packages from:

Dovecot v1.1 for Debian Testing (binary and source):

deb http://xi.rename-it.nl/debian/ testing-auto/dovecot-1.1 main deb-src http://xi.rename-it.nl/debian/ testing-auto/dovecot-1.1 main

Dovecot v1.2 for Debian Testing (binary and source):

deb http://xi.rename-it.nl/debian/ testing-auto/dovecot-1.2 main deb-src http://xi.rename-it.nl/debian/ testing-auto/dovecot-1.2 main

Do you find any compelling reason for not using version 1.0.15 ? (Besides of ACL limitations ...)

Regards,

Mario Antonio