I love the 45's fibre optics and all. I have the silverstar in .177 and the standard black in .22. They do take a little getting used to but as previously said by Nick and Tony etc they are fantastic pistols. Build quality, performance etc all second to non. A great result on the price too.
As for pellets, my .22 likes RWS hobby wadcutters, or the Bisley practice equally as much.
I tried a red dot sight on mine but it kind of takes the enjoyment out of it for some reason. You cant beat open sights on them. I also have a 75 which has the standard black sights. Another awesome even if low powered pistol.