After some seaching for an answer about the strength, durablity, quality, ect, of SG90 servos, I found this video.
Their other videos show more of the development process (a bit) but this video lets me see that the SG90 servos can hold their own.
Though they may not be ideal, I'm willing to sacrifice some quality for the great savings as long as they work like this.
edit: Then I found the second video....
https://www.youtube.com/watch?v=agR7bH-AJuk