There has been a lot of discussion about build quality and quality issues with binoculars at all price points on Bird Forum. Of course you would expect the more expensive "alpha" binoculars to have less quality problems but lately even this elite group doesn't seem to be immune from defects from the manufacturer. What brands of binoculars have you found to have better initial quality and less problems down the road? Have some brands slipped lately in quality? What's your experience been?