In reply to gfam64:
In my experience indoor ice is different and easier to outdoor ice. There tends to be a lot of solid usable, hook placements and footholds folk have booted in- due to the heavy traffic these routes get. This will not compare very accurately to you turning up at a virgin ice route outdoors where you have to read the ice, choose your placements and frontpoint (quite mentally challenging at first).
There are various types of ice and indoors tends to be snow ice which is a lot easier to climb than water ice which is fairly common outdoors.
Having said all this, the movements an indoor top rope will be useful in learning how to use your tools and poons for when you go outside.
Davie