I have an old VHS of it and saw it again some weeks ago. Boy, it is awful.
The voices were recorded in a big hall, so it seems, it echoed terribely. The actual robot fighting as seen on the Robotech Masters were as is. The same pictures, but with different roles/actors in this horrible movie. It's just laughable. I keep the tape for future education: This may NEVER happen again!
Bugger, bugger, utterly bugger.
Although the ending song was pretty good, for an eighties synth sound.
You may find it on European video rentals, 15 years ago... Maybe someone sells it on eBay.