I'm not too experienced with all the brands and stuff but i have a mongoose from pse on my bow, it attaches to the sight bracket and its removeable. i have heard of people complaining of these making noise but i havent had that happen. it holds the arrows very well and is light weight and removes super easy. but like i said i'm no expert.
One of the most important pieces of equipment that you will take hunting is a good quality pair of optics and they take some care to give you the performance that you want. So here are a few tips.
Use some alcohol and cheese cloth to clean the lenses. I will usually pick up an extra cleaning kit from my optician when I have my eyes examined.
Don't touch the lens with your fingers. If there is a stick or a bug on them blow it off.
Use the lens covers. They are there...