Man! That looks sweet. Any chance you would want to throw your old models my way so I could play?
Only things I could comment on is while the interior caustics look really nice, you could use a little displacement on the numbers so they actually appear to be "engraved" into the dice. Also, the edges look too chamfered... and it is making an ugly seam with the edges of the dice. Hoe that does not put you off. heh. Just some C&C. All in all, good work.
Sandeman