iCouplers versus opto couplers

Hi all,

is there a reason NOT to use the new iCouplers in place
of standard opto couplers like for example HCPL060x
devices from Agilent?

This would eliminate the rising edge problem from
the open collector output of the HCPL060x resulting
in unwanted signal distortion ...

A short note in experience using the iCoupler would
be very appreciated.

Markus
.