I didn't really need them but it reinforced what I was seeing while down on cue. So, to me it was worth leaving.
For example, i was beating the ghost before the sight aid but now I'm beating ghost even worse. On average 7 - 1......with a 7 -0 here and there.
Before sighting aid I was scoring 7 - 2 ....7 - 3 .....range.
Improvement to me and I need every edge I can get whether it's from my cue, chalk, glove.....etc...etc.
Rake