I for one fully support SCST as an alternative. Solid, easy to use,etc. I recently did a 10G iSCSI project based on SCST(no LIO) and it performed extremely well.
Tried to use LIO, it's a pain to pull together the kernel, and its user space and all that together(RTS repo keeps changing, document out of date,..). Wish I will never be forced to do that in the future.