100% agreed with Pat's advice as well -- unless you have total garbage (which the ProStaff 7s is not) better binoculars are NOT about better identification. Some of the worst birders I know in terms of their ability to identify birds are the ones carrying $2500 Swarovskis
The honest truth is that, other than the obsessive optics nuts on this forum, the "diminishing returns" concept for optics sets in very quickly for the basic attributes of brightness / clarity / sharpness on axis. I've spent a lot of time doing side-by-side comparisons of various binoculars, and during daylight any decent $200+ binocular looks pretty darn good.
The differences with more expensive binoculars are more about the other stuff:
- Better build quality and engineering / mechanics, better quality control and reliability (but not always)
- Better correction of optical aberrations, especially those off axis
- More consistent performance in difficult lighting and other tricky viewing situations
These are generally things that you will NOT notice in a quick side-by-side comparison standing outside the store for a few minutes swapping between 2-3 pairs in clear daylight conditions. They will be the things you appreciate (or, on the negative end, annoy you) over time as you use them hour after hour, day after day, in the field.
If you're a "hardcore" birder, using your binoculars for many hours a week, a more expensive pair with better glass will just be easier and more pleasant to use. You'll get less eyestrain, and get more good looks in difficult lighting, but this is subtle unless you're a demanding user.
And obviously your own budget level, as someone else pointed out if losing an expensive binocular will crush you financially, you shouldn't have an expensive binocular.
But there are some really excellent $200-300 binoculars out there, assuming you get a good sample that doesn't have any terrible aberrations and holds up mechanically over time, you could use it for many years happily. I know some really good birders who use basic Nikon Monarchs (not even Monarch 7 level) for example.
I still have a 15 year old Monarch ATB 10x42, the focus knob is still smooth as butter and while it has pretty bad color fringing, antiquated coatings, a narrow FOV, and a pretty small sweet spot, it's not THAT much less bright or sharp than my expensive binoculars if you're not a "connoisseur". If a cataclysm happened and all my binoculars were destroyed except for those old Monarchs, I could still bird with them happily and I doubt I'd miss many identifications that I would have made with a $1000 pair.