jaxxman,
The only changes we have made to the 998c Si units is through software, which as others have stated can be updated when you receive the unit. There have been no other changes made to this product other that software, so anyone you buy is as good as the next. Just check what software version is in the unit when you receive it and update the software if needed.

A CHO unit does not come packaged with a transducer. Everything else comes with it.