Personally, i love the Zeta Plus A1 (pictured). Though i wish there was something with an in-between form, similar to Macross' Variable Fighters, and their Gerwalk forms.
Zeta gundam
-Transformable units are generally good.-
-No, they didn't include a transformation mechanism so they could keep construction costs lowered.-
-It was only made to gather test data for the eventual upgrade to ZZ, see how the changes would work or benefits they would have, it didn't need to transform itself so they didn't bother.-