JimG, I have the very same rifle. With my eye sight, I learned real quick a scope would be in order. With that said, all I can offer is mine is a shooter. I have a prostaff 3x9x40 and shooting 300g xtps and 90g of 777 it shoots 1.5" at 100 yards off the bench.
I am getting ready to setup my son's Traditions Pursuit which I believe has the same sites as the optima. It has been recommended to me to remove the stock sites and buy upgrades. I am going to keep the forward site but I am going to go with either a peep or ghost ring in the rear.
By the way, are you having any issues with the nickel staining with some cleaners?
Good luck with your Optima....I am really enjoying mine and looking forward to deer season.