Anyone used a G5 optix sr2?

Been looking at a single pin adjustable sight, and stumbled across a deal on these. Was wondering if ànyobe has used one for a prolonged period of time. I've read a ton of reviews online think 2 or 3 were bad. But most reviews are written after 1 or 2 uses. If really like to hear from someone who had used one for at least a year.