Here is some research on ETH in this very forum:
https://bitcointalk.org/index.php?topic=1361602.msg14075148#msg14075148If the thread is too long and the issues too complex to digest fully, here's a summary so far:
Smart contracts in a real world setting that must scale can not exist without Casper.
The virtual machine for smart contracts runs, but any sort of real world scaling of the virtual machine requires Casper.
I have explained why Casper can't possibly work and my point is unarguable.