The very first SG camera i was sent ( the SG9665GC V1 ) i had to refocus the lens after a while.
Years later in another batch of SG cameras i got the SGGCX2 camera ( vanilla version ) it somehow manage to back itself into a corner, but flashing the same firmware fixed that up for good, or at least until next firmware was released for me to test.
I think it was also in the same batch i got another camera, but cant recall if it was the SG9663DC or the Guard track GT65EX, but the problem was a wonky GPS antenna, i just plugged in a older GPS from another SG camera and i was good to go again.
O and then "lately" getting the SG9663DR to test, i have somehow managed to get its WIFI to be one no one can connect to, it just will not work no matter what have been tried, and a lot have been tried, no matter though it have a screen and work perfect otherwise.
On all occasions have the SG boss offered to send me a new test camera or GPS antenna, but i am resourceful and would never expect ask for something like that on what is essential free products.
If the camera had completely crapped out, well then i would of course have liked a new one so i was still able to test, but not something i would expect, and others have also gotten test samples so it should not be absolutely necessary.
I have been testing on the latest 2 Viofo cameras, and here viofo have also been extremely helpful, first i got the A139, then a few months later i got my car broken into and that system partly vandalized, but Viofo sent me a new one.
And the testing the T130, the memory card with the firmware for the rear camera died mid update after only a week or two, meaning the rear camera did not work, again viofo stepped up and sent me a new rear camera, and threw on top a new rear camera wire and a CPL filter too as the original one had some issues staying fixed well.
In General i have only seen SG operate fine in regard to their products and customers, and something like that i would not mind pay a little extra for.