RE: which sights have worked well for anyone--
I' d say it shouldn' t take more than a couple of weeks to a month to get to the point where you could consistently shoot 3" groups at 20 yards without sights. Another few weeks and you' d be shooting 4" groups or better at 30 yards. When you' ve got that letoff, you can really take your time and concentrate on the spot you want to hit. MUCH easier than shooting a stickbow instinctively.
The whole trick is to establish a fairly high anchor where the arrow' s nock is directly below your eye, and then learning where to hold the arrow' s tip in relation to the target to make it hit center. It doesn' t take long to learn how low or high to hold for various distances. On really long shots, like 70-80 yards, the arrow tip is above the target, so I use different parts of my arrow rest and the shelf as aiming references.
If you' re not going to be shooting competition, you can even take a magic marker and put marks on the belly side of the sight window to help you with elevation.
If you don' t want to mess with your main setup right now, drag out an old bow and give it a try. You never know how you' ll do until you at least take a stab at it. I think you' ll be suprized at how good you can do without sights.
Maybe I' d best explain a little more about the anchor. I don' t mean you have to have the nock resting on your eyelid. I mean you don' t want to be anchoring under your chin. The corner of your mouth is plenty high enough, though some barebow shooters I' ve known get it up around the cheekbone. You just want to be sure you' ve got the nock of arrow at a point on your face that is directly below your eye.