Having a small experience with the QCY HT05, which I have been very satisfied with so far, I decided to explore the other models that QCY has to offer.
Regarding the T17, I have to say that we are talking about headphones that you can find in the Greek market for 13-14 euros and you can have them immediately available without waiting for days for them to arrive. This alone is very positive for me, as I am used to making purchases from China, where for the money you would spend, you can get something that is generally better than what you would get for the same amount of money in the Greek market. Here, however, we have the shining exception to the rule, they have the same price no matter where you buy them from.
Certainly, you won't get the best build quality or the latest technology found in more expensive models, but what you will definitely get is a very reliable pair of headphones that, considering the price, are amazing. They have good and powerful sound, a nice and comfortable design that fits perfectly in the ear (ideal even for lying down, which is a big plus!).
From personal experience, the call quality is satisfactory, I had no complaints about how I sounded and I can say that for the first time with such a cheap pair of headphones, I managed to talk on the phone. Although I had some minor issues, which I can't fully blame on the headphones, I think I just didn't handle them properly.
I wore them at the gym and while music was playing, I couldn't hear anything at all. Of course, at one point, when I moved about 8-9 meters away, the headphones disconnected, which is quite a good distance, especially for home or office use when you just want to grab something or make a move comfortably without dragging your phone behind you with the cable because you forgot to take off the headphones. But to get back to the gym, I have to say that I started sweating A LOT, but I wasn't afraid for a moment that the headphones would fall out of my ears. With the cushions already applied, they fit perfectly in my ears. However, I noticed that the sound started to distort for a while and I was afraid that I had damaged them, but after wiping them with a towel, everything was fine again.
A BIG PROBLEM, which of course I solved with a lot of effort, is that for some reason, it recognized the right and left earphone as separate devices on Bluetooth and I couldn't listen to both at the same time. Also, I see that there is no way to reactivate one earphone with the touch controls (although I'm not 100% sure, but as far as I searched, I couldn't find an answer), so you always have to have the case close by (although, to be honest, I have never left the case at home and only took the headphones, and I don't think anyone else has done that either).
In conclusion, I have to say that they have a GREAT BATTERY, they last for several hours, I can't say exactly how many, but definitely more than 3 on low to medium volume (if you turn it up higher, it will blow your eardrums!).
IN A FEW WORDS, GET THEM WITHOUT HESITATION!