Hi Leon

Just worked on a Hyster r1.4 matrix early this week.
it had 2 AC Zapi controllers. The one good thing was my standard zapi handset allowed me to access the units and make parameter changes.
Also if i had to guess controllers from zapi would be possibly cheaper than from BT, and Zapi near us are very good when it comes to their controller repairs.

Whereas BT stuff i have had difficulty repairing them myself or getting them repaired anywhere, and price wise has always been very expensive.