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I previously installed a Holosun 510C red dot sight on my Rimfire Challenge rifle, and it works well. When I needed a durable dot for my PCC I started looking for a good deal on another, and found this green dot version at OP for a great price. I've installed Holosun RDS on several of my pistols and rifles and found them to be reliable and feature-rich at a reasonable price.
Regarding the 501C, I like the large lens, easy controls, the dot-circle reticle options, and the fact that it doesn't have to be removed to replace the battery. The shake-awake feature is very sensitive and combines with the solar panel to lengthen the battery life. It's lousy to pull your gun out for a competition and realize that the sight is dead. The metal hood can be removed, as several competitors I shoot with have done to save weight, but I like the durability it provides.
The fact that this is my second 510C speaks to how much I like the features and value of this Holosun RDS.
I've found this Ammo Inc .380 ACP ammo to be very reliable in both of my .380 pistols. It cycles well and I've never had an ammo-related issue. Several other brands have had numerous issues including primer failures, failures to cycle the slide fully, failure to extract and eject, and stovepipes. The 100 gr RNFP bullets have performed well for me in numerous competitions, reliably knocking down steel poppers and plate racks. Shipping from OpticsPlanet was fast.