I own an Leica ER 2.5-10x42 30mm. Glass is amazing and it is extremely durable. I am hard on my gear and only started using any sort of scope cover this year. The objective has been covered in water, snow, leaves, dust, wacked by sticks etc and doesn't have a mark on it. I have had the scope for 8 or so years now. Great eye relief, crystal clear glass and excellent ergonomics. I can't speak to the quality of their turret system as mine is capped but I am sure they are great.