^ all good points.
for all of my 25 years of shooting i shot a multi-pin sight but when i set up my new bow this year i realized my astigmatism caused all the pins would obscure and became tough to separate. later i went to a another style of multi-pin and then a single which made an enormous difference. it was great but once i saw what HHA had going i quickly bought one and in the end i wound up with a 5519xl.
my only mistake has been not trying one earlier.