Does the glass start near the floor, are you very tall, or do you use a rod to raise and lower the shades? I had to leave pull tabs/cords on ours or I would not be able to reach without jumping. (What a difference 4" can make!)

Can you go to a showroom and try some out? Ours are only 48" wide but they operate nicely. If they are offered in 70" wide standard I think the mechanism should be fine.

I have cordless roller shades on windows that are 5 ft tall and 6 ft wide. Mine are in a cassette and they have a short (less than 12") cord in the middle so I can pull them down. I bought cheaper ones because these are for rooms that don't need the shades pulled down very often. If yours will be used often, you might want to consider getting ones with a good clutch mechanism.

Oaktown and dekeoboe, thank you both for your responses. I had difficulty signing back into gardenweb and couldn't access until now. It's a relief to know that others have no problems operating a shade with large dimensions. Reaching a roller shade at 70" would be no problem for me. Dekeoboe, thanks for the heads up about a clutch mechanism. The problem is that I wanted solar shades on a roller shade. A local shade shop tells me that due to the open weave of solar mesh, it is inadvisable to use the material in a roll up shade format. After about a year or two the mesh at the bottom would begin to pull apart. That makes sense. Code for my gulf coast area requires that glazing needs to be LowE3-366 glass or an equivalent glass by another glass manufacturer. My goal is to further filter out uv and infra red rays beyond what the glass provides to eliminate fading as much as possible. There is not enough side wall space for fabric. I need some view retained through whatever is used as will feel too closed in with regular solid shades. It's a problem I'm still researching.