clones in rockwool cubes

This is my first time cloning and i have a few questions. Im thinking about buying 98 rockwool cubes 1.5x1.5x.15. Can you reuse a rockwool cube? how big should the cubes be? Im planning to just use it till the clones take root then transplant into soil. Is it easy to remove the roots from the rockwool during transplant?

peat pellets are far better, especially in soil. And no, you can't rip the plant out of either, you don't re-use them.

is 1.5x1.5.1x5 big enough?