I own both. I am not a gunsmith, but when I want to look at a bore, I reach for the Hawkeye, not the Teslong. I find it much easier to fire up the Hawkeye than pulling out a laptop, booting it, plugging in the borescope, opening the software, etc., not that either one is really all that difficult to use. The differences are that the Hawkeye has both optics and features that far exceed the Teslong. Those features require complex engineering and design parameters, which is why the Hawkeye costs around $900 and the Teslong as low as $50. For an inexpensive borescope, the Teslong has VERY good optics, much better than previous modestly-priced borescopes. Compared to those borescopes, the Teslong is a game-changer. However, it is not a Hawkeye, not even close. The Teslong also has the advantage of image capture, something most people will never feasibly be able to accomplish with a Hawkeye, due to the extremely high cost. If the features and optics of the Teslong are sufficient your needs, which they probably should be for at least 95% of shooters, I can't imagine why someone would spend an additional $850 for a Hawkeye. I bought my Hawkeye well before the Teslong borescope was ever available, and I use it regularly for the reasons I described above, I simply find it easier to use and the optics are unquestionably better. Had the Teslong been available at that time, I would probably only own a Teslong, as it is certainly sufficient for my needs.