I have the Js2k one as well and like I said you just have to install it right. Mine makes 0 noise and while is vibrates alittle when driving its hase never folded iteself down or anything (not even at 100+mph). There is no interferance with the soft top (I do leave it up all the time and have never tried to put the top down with it folded down). If the top is up you can't open the secret compartment very far but it does still open alittle. Anyways I am very happy I did it even though it was a pain to put in. I have one of the tinted ones so it also helps with headlights blasting right on my rear view mirror and blinding me.

 

^The wind when driving actually pushes the screen from the rear towards the front so you should not have an issue with it folding down on itself. Also, if top is up to open the secret comp. all the way, just fold it down.

 

I have Ricks. I've had the full and 7/8ths sizes. I thought they both cut down on turbulence compared to stock. Until I broke each one. Then I realized that they didn't help all that much more! But they did help a little.

I'd go with the 7/8ths one. It looks better.

To stop it from rattling, just get two rubber strips, each 3 inches long and about a half to 3/4 in square, and glue them in front of the deflector, so that the deflector is putting slight pressure against them, and no more rattling. He puts some of the strips in his kits.

Go to his website, the instructions are posted.