What can you say about a screen guard? Unless you intend to pay a lot of money for specialist types, they either fit or they don't, and they either have decent standard adhesive or they don't. These fit well and my first one went on without any problems. They are a good fit so you have a little leeway around the edges incase you don't get them exactly aligned.
As far as I can tell this one doesn't have any special properties to enhance the retina display. Maybe this affects the clarity, maybe it doesn't, I'm really not sure.
Just some advice for fitting.
Fit in a steamy bathroom after a hot shower. (The air moisture traps the dust in the air).
Before fitting, rub the screen with a finger tip dipped in clean water, and then rub dry (and clean) with the cleaning cloth provided). This gets rid of grease and dust on the screen.
Peal the back an inch at a time, and apply each section as you peal the backing away using a credit card (or something more flexible) to smooth out any bubbles - this way you can make sure you align it properly. If you have ever covered a book with library film you will know exactly what I mean.
Using this technique I find I can get a screen guard on first time and without dust or bubbles.