I could definitely see why some men might want to use this kit. It's super convenient to do this kind of basic fertility test in your home, where it's just you, your sperm, and maybe your partner. The test is pretty cheap too — for two sets of supplies it's only $50. By comparison, the Trak kit is $200, and comes with four sets of supplies.
That said, I didn't feel like there was much more I could get out of my results besides knowing that my sperm are most likely healthy and seeing video of them. When it comes down to it, the test really only gives you a yes or no answer — "yes" being a moderate/normal range, and "no" being a low range. I'd have loved to get a slightly more in-depth analysis. For example, did I barely break the six-million moving sperm mark, or did I have closer to 20 million moving in there?
Maybe that would have given me a better idea of my exact fertility, IDK.
On the flip side, if I had been in the low range, what would the next steps have been? I'd probably have had to get a doctor to test for concentration and morphology to give me a more rounded view of the health of my sperm. And even if I was using this to just casually track the health of my sperm over time (since you can reorder supplies), I wouldn't have known what to do with my results if they had come back as low — the app doesn't provide any advice on how to make your sperm healthier.
So I guess that regardless of what your results are, if you're seriously considering having a kid, going to see a doctor about your fertility is still your best bet. Not only will that give you a more accurate idea of all three factors that go into the health of your sperm, but they'll also be able to give you the advice you need to make your sperm strong. But for me personally, I'm not jumping on the baby train just yet...so I'll worry about all that later.