Just so that Jim Moore doesn't make his decision based on just one
opinion, I would add my two cents.  Bruce Clark's response is exactly
what I would say, too.  In addition to his remarks, I will tell you that
I once modified a drawer to the Ampichron configuration.  Most of the
normal components on the bass side of the drawer must be relocated to
make room for the clock.  There doesn't seem to be a standard way of
relocating these components.

Most people feel that clock was a dealer add-on and thus original
installations show little uniformity.  In some cases, the rewind brake
is totally removed.  It is possible to leave everything in the drawer.
The external valves Bruce mentions are a real pain.  Several small
control pneumatics must be located on the outside back of the drawer
or on the stack area.  Putting them on the stack requires additional
harness tubing and putting them on the back of the drawer creates a
space problem when the drawer is closed.

Once the chime roll is cued up, the piano becomes useless for other
rolls.  To cue up the chime roll may take 20 minutes, if done late in
the day.  The best bet is to cue the roll just before 7AM.

It is a neat gadget but a pain.

Bob Taylor