Ehem..I'm not quite sure as this wasn't discussed,but still
UU-matter is friggin' expensive,friggin'
Other mods,where you can create diamonds - can give you much faster diamonds,than waiting for 9kk of energy to be collected and used
at least 2-3 items would make sense,and not to mention,that - you WILL find diamond with alot lesser efforts by yourself,using pickaxe and searching or just collecting coal
Basically,this UU-matter proved to be usefull to craft rubber and redstone xD
If it could be a lapotron for 9kk...this would be slightly better offer
same goes for crafting iron,gold and tin ore - if it would be a block of resource - it would be of SOME use
So,the idea in short - UU-matter hugely underpowered
(I wonder,if it's possible for uu-matter to be used to replace any item,that is used for crafting-eg i'm trying to craft an golden sword and I lack one gold - replacement with matter and so on)