i think because of the lack of QEV and simpler operating system, it may not be as consistent and suffer more shot drop off at high rates of fire due to a reduced air flow.
purely my speculation though.
the solenoid in the eteks can operate at much lower dwell settings.
at the time of testing robert p. had one in his sl66 and was enjoying the benefits. so no, that wont impact on performance.
how can you say "better cycling" really? care to explain?
no doubt the etek you shot wasnt tuned at all perhaps.