I finally got to shoot my 870 this evening for the first time since I mounted my Speed Bead on it last week. Here are a few thoughts on it after using it for the first time.
Pros:
1. Plenty bright but not too bright and size of dot seems appropriate
2. Doesn't seem to mess with my field of view very much at all
3. Allows me to shoot with both eyes open which feels very natural to me
4. Easy on/off
5. Seemed to hold zero very well
Cons:
1. The only one I could find other than it being a little aggravating to mount was that making adjustments was pretty much a guessing game. However, I shoot bows a good bit so making adjustments wasn't that bad for me honestly. It did take a few tries to dial it in completely but now that it's there I feel like it's there to stay.
Link to a few patterns I shot with it today:
http://oldgobbler.com/Forum/index.php/topic,1202.0.htmlAll in all, I think I'm going to really like it!