Right off the bat an 8 element has to be a real challenge in construction, upkeep, durability, and tuning. You really have to consider the weather in the area you live in to justify one of these.
The SE Quad has been well discussed and by most accounts is a very effective operator if built and tuned correctly, but the kit materials used leave a lot to be desired.
The Maco no longer slots their tubing and that is a negative, but for the most part is more durable than the SE Quad.
Jay’s antenna on the other hand will likely be as good as it gets in these regards, but operations have not been tested as best I know. I have heard rumors, but that is all thus far. I think one operator on this forum has one of Jay’s beams, but has thus far made no comments.
They will all have a problem with rotor support since they are so large. These are not projects for beginners or the faint of heart.