I shoudn't talk about something I didn't use but here the numbers are so HIGH I coudn't resist to send a warning !
A) 20-360X100 : excuse me, but, LOL.
It would translate to 5 - 0,28 mm exit pupil.
0,28 mm exit pupil for such a bino = bullsh*t. It translate to power = 3.6 x diameter. Even with a top perfomer astronomical telescope, and on easy subject as bright stars,
0,28 mm is not funny (dim and hard to maintain aligned with the eye) ; it can be (is) used for very special usage (double star splitting) in very special condition (sky without turbulence).
Even for planets (bright but extend objects) it is too much in practice (in practice 2D is considered a good "limit", even if 2D is in fact a lot and not very comfortable).
All of that comments was for high constrat objects.
Now imagine 3.6 diameters on terrestrial : objects with much less constrast, atmospheric ground turbulence... ==> quality of sight = bullsh*t.
==> Don't trust me on my subjective words, and find your truth by yourself : make this little test : in front of the objective of your bino (or telescope) put a mask with a clear aperture whose diameter is [power x 0,28] (in mm).
Example : if power = 8X ==> diameter of clear aperture = 2,24 mm.
Look and estimate by yourself...
==> your millage may vary, but for me in practice I would say the effective part would be a 5 to 2 mm exit pupil. 1 mm would be very casual on terrestrial.
B) a quik search on ebay shows a dealer who gives these "specs" :
- it is marked "20-360", but there is the "Nikon Magnification" (LOL-LOL) = 20-60 (ok, less funny than 20-360)
- optical diameter 80mm (and not 100mm)
it translate to an exit pupil varying from 4 to 1,33 mm : much less comical, if the quality is very high : but is it possible for 50$ ?
This would be a miracle !
Perhaps they are not too bad at 20X.
OK, I stop my cynical comments. Just be aware of the marketing hype.