I've had both the auto and manual versions of it and am a big fan. Swampfox makes good dots for a fair price; I'm led to believe they're made in the same factory as Holosun overseas, but don't quote me on that.
For comparative purposes the glass and reticle are effectively identical to the Holosun 407k with a bit lighter pricetag. I also find the sight picture more enjoyable than the Holosun, which is bomb-proof but at the expense of having just as much plastic housing as glass in your sight picture. Probably no need to bother with the add-on "ironsides shield" unless you throw your pistol off buildings regularly. The auto or manual version would pretty much just be up to your personal preferences.
Also, if you're buying direct from them you can use code "freedom21" at checkout for a 21% discount. If you're LEO/Mil they give 30% off. Their customer service is also really good.