TIP: Mount the clip to the phone and position it directly over the camera sensor before you screw the lens onto the clip. Makes lining up the lens much easier. Make sure the clip doesn't move while threading on the lens. Also, please note the macro and wide-angle lenses are a set. To use the macro, you need to remove the wide-angle lens from it (it's basically a 2-in-1 lens, while the fish-eye is a totally separate lens).
I bought this because I needed a wide-angle lens for my second phone, which I use as a dash camera in my car and truck. The original field of view wasn't really wide enough to be useful. Looking online, I found a number of options before I found a Best Buy store a half hour drive away that had this one in stock. Local availability is always a major plus in my opinion.
The build on this lens set is decent. I am not sure if the lens frames are aluminum or composite, but they are quite sturdy and don't feel like they would break if I squeezed them hard, like some other products like this I've seen. The clip is standard-fare plastic. I can't say how durable it will be in the long run, but it seems to be acceptable right now.
Quality of the images is very impressive. The fish-eye and wide angle lenses do exactly what they should. The fish-eye is advertised as a 180 degree FOV, but in my experience, it's more like 160 degrees, which is plenty for me. The wide angle lens just expands the FOV just a little, maybe 20%. I haven't measured it. It's not that noticeable unless you take a comparison picture along side it, but it does expand the view a fair bit. This is actually the lens I settled on for my dash cam application, as it provides the best balance of FOV and image quality.
The macro lens is amazing. I've attached a couple of pictures I took of a gold $1 Presidential coin. The fact that they were taken with the low-end camera in a Galaxy Core Prime is amazing to me. If you are for some reason unfamiliar with the gold $1 dollar coin, they are very near the same size and thickness as a US quarter, just barely larger.
The only issue I have is I can't really use the flash with the lens on my phone. This will of course depend on the design of the phone, but most phones place the flash very near the camera sensor, so the additional lens creates a big shadow when the flash is used. This is a somewhat minor issue, but it is something to consider.
Also, if you have a very thick case on your phone, this may not work. For best results, the clip needs to be directly on (i.e. touching) the camera window on your phone. On one of my phones, the case is thin and the camera is only about a half millimeter from the clip and it works great. The other one has a thicker case, and the clip floats about 1 to 1.5mm above the camera. It still works quite well, but it is a bit more difficult to line up the lens perfectly. If the lens isn't lined up, you might get some extra distortion and darkness around the corners. As with any optics, the further the lens is from the camera, the worse this becomes.