I laughed at those flip up covers for years, thought they were "to easy and had to be gimmicky". Then when I bought a Swarovski 5 years ago, it came with a set. WOW! Wish I woulda gone too them years ago. I now have them on every single scope I own. Some of them are the Blizzard or see thru type and I actually prefer them as the less exposed too the elements your lenses are the longer the coatings will go without being scratched up (whether we admit it or not, even with proper cleaning, we are mildly scratching the lenses and coatings each and everytime we touch the lenses to clean them).

As for the yellow, I suppose it's a mental block and under hazy or dark timber conditions they do contrast game. But I prefer to stick with clear covers. Unless it's really dark or the weather is perfect and I need a really detailed look, I leave the clear covers down and never flip them up.

You'll like em,
RA