I got one of these sights last year while at the Munich World Cup. I was looking for a low profile sight for air rifle. And this works great for me. It has one potential big issue, which I will discuss later.
But it is very well made and pretty ingenious engineering. It's small. The base measures 45 mm in length, 34 mm in width (54 mm with knobs. Add an extra mm for the mounting screws), and 40 mm tall. For it's small size, it does have a little bit of heft due to it's stainless steel base. It weighs about 165 grams without an iris, but still 35 grams less than the Anschutz 7020 sight.
The main point of this sight is the elevation knob is nested inside the windage knob on the side. This takes a little getting used to, but it's pretty easy. One thing that threw me off initially is that when turning the windage knob, the elevation knob also turns. But the actual elevation setting does not. When turning the elevation knob, the windage knob does not turn. Anschutz said this is the correct function. So the only issue really is if you keep track of your sight zero while watching wind. There are indication marks to read the sight, so you can still do this for left/right windage adjustments, but you have to keep track of elevation. But this technique is pretty much a lost art in the international game. But you can still do this with this sight.
The one thing I'm not sure why they did it is the sight base is slightly offset to the right. So when the sight windage adjustment is in the middle of travel, the rear iris will be to the left. So unless you have a way to equally offset your front sight, you have to click way right to center up the sight. For my air rifle, I was able to get sighted in, but I didn't have much more room to move right. Not that big of a deal for air rifle, but I think you'd run into issues with smallbore.
But I prefer to center my windage. There were two ways I did this. The first was I have a set of off-set adjustable riser blocks. I set my rear sight windage in the middle of travel, then played with the rear and front riser offset settings. It was kind of tricky to get this set. What I ended up doing, though, is not using the offset risers, but rather rotating my MEC extension tube. I basically sighted in by rotating the tube rather than moving the sight. Once set, I clamped down the tube for good. I only did this that one initial set up time, and now I fine tune my sighting moving my sights. But now I'm in the middle of my windage travel. Once again, not that big of a deal for air rifle, and my extension tube allows me to do this. For me, I actually like this slight offset. But unless you have a way to equally offset your front sight, you will have windage issues.
One other thing to be aware is if you try spinning the elevation knob fast, the windage knob might turn a click. But I'm talking turning really fast. No issue if you click normally. But keep that in mind. These are very small clicks (24 per revolution). So if you have to move your elevation a lot, don't spin like crazy.
One final thing is the knob knurls are kind of sharp. They don't cut, but they are a little sharp. Keep in mind when I got mine, it literally came off the milling machine that morning and was rushed to Munich. So maybe they didn't buff down the cut edges. The rest of the sight's edges are nice and smooth.
All-in-all, this sight is exactly what I wanted for my air rifle. I wanted a low profile sight. There are other low profile sights out there. It looks like Centra has a couple. And all these sights are expensive. But like I said, the Anschutz sight is very well made, and I am very happy with it.
I have not tried it for smallbore. One of the selling points in the Anschutz literature is it's easier to stay in position in prone while moving your sights, and it's better to see wind flags. I don't recall a knob on top of a sight blocking wind flags, nor do I stay in position while loading for prone. So for me, having the knobs on the side are not that big of an advantage. But a low profile for standing would be. But I already have a bunch of Anschutz 7020 rear sights for smallbore, so I'm in no hurry to try the Precise sight outdoors yet.
That's all I have. Hope this helps.