I've had two. First was awful, first symptom was shooting pain in right testicle. First thought was not kidney stone, that came later after a CT scan. Which showed a single 4 mm heading down left side and a "scattering" of smaller ones in the right kidney. Yay! More to come... Second was I guess one of the little guys, hurt but nowhere near as badly. Had another incident with pain in right testicle again recently, might have been another little one, unconfirmed. Haven't been able to catch any of these stones, unfortunately.
Been taking magnesium (citrate) supplement and quit drinking soda altogether (thinking this may be what caused). Fingers crossed, I don't want anymore big guys forming in there.