Curtains Question

Okay I've been looking at getting curtains for my UCF10 and had a few questions. First, I've seen a lot of pics with cars with curtains on the front windows, and was wondering if you loose any visibility with them since you can't really ever have them closed. Also, I've seen a couple pics on here where people use two sets for each of the back windows, or so it seems, so I guess you would pull each side to the middle instead of pulling one across, which is the "right" way?

I had curtains on my G35 and there wasn't any type of visibility loss due to the factthat i spaced them from the B-pillar so I could still check my blind spots, on the rear windows questions I've only seen that for the rear window only and not for the rear door windows... you have any pics of that setup?

My car HAD curtains, til the tint guys pulled it off and I can't ever stick back on, I think I need some new ones.....
Mine had on all 4 doors, the fronts just retract to the hook by the B pillar side of the window edge, the rears are exactly the same as the fronts, only that it goes the other way around and also retract to the B pillar....

where can you get these from?