Vostok was never really on my radar until I read an a watch forum that they are known as the AK-47 of the watch world. They are often very plain looking or even ugly at times and while being very affordable they just work well. I also saw a video online where a man tests various watches in a pressure chamber and he was testing a cheap Scuba Dude Vostok. That watch went to something like 125 % farther past the advertised rating and so much so the acrylic glass began to show stress fractures. I was sold right then and today have maybe 6 total Vostok watches.
I also saw a video on the very watch you have mentioned above (Radio Room)and they were doing a torture test. Before the testing began they put it on a time graph right out of the box. It was showing dead on at zero sec per day and had an almost perfect beat error. Now I know that result can happen to any automatic at times yet it was impressive for a watch under $120 dollars. The torture test went well and after all kinds of abuse ,including extreme pressure testing, the watch was still performing within a few sec per day.