I recently bought two Ronda 763 5 jewel movements for $18 each.
What stroke me up front was that both movements had a rather good accuracy and ran with precisely the same speed. Ronda clearly adjusts accuracy at factory very well.
I did not pay much attention, but recently I tested their accuracy and now I cannot comprehend what I see. At room temperature, both movements are ~ +115 SPY.
But when worn 24/7, they are +0.7 SPY.
So, I have $3000 AQ4030, which is +9 SPY when worn 95% on wrist, and a ~ +1 SPY cheap movement worn with the same day to day usage pattern.
In practical sense, this means that I paid almost $3000 for a "pretty watch", and not for the accuracy it provides...