The parallax adjustment works, glass is decently clear, illumination is plenty visible unless the sun is shining directly on you (in which case you don't need illumination). I put this scope on an 8mm Mauser rifle with custom loads putting out over 3000 ft lbs of energy shooting out to 600 yards. It holds zero no problem and makes hitting torso sized targets at that distance pretty easy. The glass isn't as clear as scopes that cost 10-20x more, but for casual target shooting at medium to long ranges, I've never seen anything close to this scope's price point perform this well.

ohhunt LR FFP 4.7-28X50 SFIR First Focal Plane Hunting Riflescope Side Parallax Glass Etched Reticle Lock Reset Scope

Very, very well built scope.
Most aspects of this glass leave far more expensive articles in the dust.
For the customer, the limitations need to be made clear, however.
The turrets work well (see later) and respond precisely to adjustments.
The sight is clear, but not as good as scopes that are in a different class of expense, obviously.
I had an anger episode comparing it's very low light capabilities with an other scope with very nearly the same objective aperture. That episode abated once I made myself aware of the fact the other one cost about 15 times as much. This one isn't bad, it simply doesn't offer the very limit of low light visibility the competitor does. It's fine in twilight, picking up a clear sight picture from scattered light is not it's forte.
Tracking is works great and returns to zero any time.
Zeroing is imperfect, because, yes, the turrets can be taken off, but no, there is no fine grained way of putting them back on. The gears the turrets match to have a couple of dozen teeth, whatever the position closest to the zero mark that you can fit the turret back on is where it's indicated zero is going to be. Unless you're willing to use a pen on the outside of the scope to mark your own zero for the gun, this could be improved.
I never really check for parallax accuracy, I just twist until it looks right, but I haven't observed any problems with deviation between magnification focus and parallax adjusted focus, for what it's worth.
The reticle is clear, but not overly thin at 28 magnification, that's the price you pay for it being visible at 5x, too. At the brightest setting, illumination is invisible against well lit background, but there the black reticle will do fine. On poorly lit background,there are 6 adjustment steps with an OFF between each of them.
Being aware of this scope's disadvantages, I own two of them. Need I say more?
BUY, if you can live with the limitiations, forget it if you can't.