When using binoculars I've never been quite sure how our brains reconcile the two images if they're slightly different. Apart from blinking one eye shut and then the other, back and forth, I've never been sure exactly how to check the focus adjustment on the adjustable side. So, I get the size of the object I'm looking at as close in size in each side with the rapid blinking technique. Then I adjust to inter lens distance (inter pupil) to try to get the image to look like it's in one circle. Once that's done I can read a phone number off a neighbour's burglar alarm box 250 yards away.In daylight the image is bright and clear. That has to be pretty good doesn't it?I haven't tried dusk or dawn lighting yet but the brightness of the daytime image suggests that will be okay (or even good).The focus is nicely damped but not stiff as is the hinge between the two sides. My young daughter can operate these without a fuss and I don't sense any hysteresis in the mechanism.I wish my eyes were better to comment further but I can't fault these optically.The rubber coating seems fine. The strap is fiddly to attach but just needs a little patience. The soft, but padded case is just a smidgen too small - it takes the binoculars ok but not the (quite thin) neck-strap, so the strap has to remain outside the case. [Update] If you flatten out the binoculars you can fold the neck-strap just enough to hide it in the gap and close the case. Hmm... I like to pull them out of the case ready-to-go..The soft rubber dust/lens covers are okay. I like that the eyepiece covers are joined together and are threaded onto the neck-strap. The object lens ones are moulded with a ring that runs around each mon(?)ocular and stays in place mainly by friction. Time will tell if this rubber will remain pliant and grippy. The covers are functional but not exactly works of beauty!With no other binoculars to test these against it's hard to rate them but they do everything they're supposed to and I would definitely consider buying them again if they got lost or broken.