Several prototypes and proofs of concept of reversible (quantum-inspired) digital circuits have been successfully realized these last years, proving that
digital reversible dual-line pass-transistor technology
may be used for reversible linear computations. In order for this new technology to be used in commercial applications, several questions have to be answerd first. In particular, the number of gates possibly cascaded, the maximum reachable frequency, the maximum acceptable delays and amplitude drops are the key issues discussed in this paper.