My most important binocular overall was my first step to a premium binocular back in Sept 1997 when I bought a Swarovski 10X42 SLC WB. That was over 25 years ago and I still have it, the box, and receipt! After that point my eyes were open. Next eye-opening was in 2015 when I bought an SV 8X32 and decided I didn't need the weight/size of a 42mm binocular any longer and that SV became my favorite and most used birding binocular. I've owned many others along the way(still have most of them) but those two really made an impression.