Speaking as someone that sees the old Mirror type system and two other electronic type systems in use. The most errors are definitely with the Mirror System. The number of times aircraft stop short on these or pilots can't see there stop markings at night is a frequent occurrence.
Whereas the l@ser Safedock type is a lot more reliable.
Utter Rubbish
Properly positioned mirrors or nothing whatsoever equals easy parking. Maybe people like 'Out of Trim' shouldn't be allowed to taxi, especially at night. In fifteen years, the only time I have missed my stopping position (let's not talk about taxiing to the wrong stand) was with a brand new 'oh-so-clever' laser parking jobby at EPWA - Stand 4 to be precise. So please, no gizmos, just low tech.
PM