Robert M. Gary wrote:
It made a poor multi trainer for FBOs because the FAA would not issue
"full" multiengine ratings to students who took their checkrides in it.

-Robert

That and despite the advantages of not having any asymmetric thrust
issues, it doesn't fly any better single engine than most twins.
The rear engine is prone to overheating as well.

All Cessna's ending in 7 are odd birds.