Those vytex prices do seem good . That is for replacement i would assume? Todd, its been a year since i have seen the vytex so i would really need to put the vytex and soft lite side by side to make distinctions. I remember seeing the vytex and liking the look quite a bit. I did operate it and it was definitely solid. The potomac had a slightly different frame from the fortis, thats what i was told at the time. From the brochure, that does seem to be the case. Screen was solid but i dont remember if it locked, the elements does. I did see the sliding patio door and it reminded me of the soft lite " kings royal" in many ways. Very sturdy and operated very smoothly as does the soft lite. I would recommend it unless the price is outrageously high. Both of those patio doors also come with a sloped sill rather than a pocket sill. Patio doors with pocket sills also seem hard to operate for whatever reason and that can be an issue with elderly customers. Pocket sills are notorious for clogged weep holes and thats not something you want happening with a patio door when you have heavy rains. Same goes for a double hung window. stay far away from anything that has a pocket sill, capture sill, or a sloped sill that is merely snapped in opposed to being welded. You can easily spot a pocket sill by noticing weep holes with plastic flaps on the lower part of the windows exterior. Those flaps are meant to open and enable water to escape. Issues arise when those weep holes clog and usually those flaps break off and allow bugs to enter the window. Sometimes a window brochure will state their windows use a welded sloped sill and thats what you want.

Builder Bob, you seem to have a real bone to pick with okna for some reason, that seems to be clouding your judgement. Looks like homeseald laid the ratings out above, I cant really say much more besides those facts. Makes no difference to me, but I think the vast majority of people disagree with you. You should probably stick to building stuff and leave windows to the window guys. Cut rate builders are probably the only guys that would like a cut rate product. Best of luck my friend. It will be interesting to read back through this in a couple of years if they are still around. Your posts kind of sound like you are trying to make this an advertisement for vytex, but you forgot its not that great of a window:

For the sliders, I'd look into a remote controlled roll down shade mounted outside above the doors. You can get them in different degrees of opaqueness, to control the light, but they will not give full privacy at night unless you get opaque, which won't work in the daytime unless you want black out. Most people have some kinds of lights outside their doors, so if it's lit outside there is no 'black hole' effect for uncovered windows. On the corner windows, I'd want bottom up shades so they could be partially covering the bottom part of the windows for privacy (the only part anyone could see in), yet you can still see out over the top and get the light. They also make vertical cellular shades that stack to the side and pretty much disappear. Outdoor mounted roller shade:

You are partially on track, partially off. The Okna lines and Vytex higher models are top performers. Marvin Infinity is a pretty, well-built window, its just not in the top tier of thermal or structural performance. Its a worthy candidate if your needs and wants for the project fit. I wouldn't consider the others. Lastly but certainly not least, I'd strongly recommend Windows on Washington if they serve your area, best in the business. If your your current Okna quote isn't from them, you'd be well-served to give them a call.