As a solution to a problem, I give this a 5-star rating. The Z does starve itself of fuel on long, high-g, right-hand turns, even with the tank at 3/4 full. This solution works as advertised, delivering fuel from the left side of the "saddlebag" tank directly into the primary fuel pump basket, instead of letting it try to suck fuel from the small cross-over tube at the bottom of the tank. Several track days and spirited drives have proven its durability. The secondary fuel pump is somewhat noisy (it makes a humming sound that is more noticeable when not submerged at low tank levels), but solving fuel starvation is worth it.
Installation is somewhat difficult. Visibility through the tank openings is poor. It was challenging to decide how to place and direct the new pump harness and output hose across the tank so it did not interfere with the level sensor float. There was not much guidance in the instructions. The fuel sock is a Holley product, and likely "universal". It is slightly too big to lay flat across the bottom of the Z fuel tank. The stiff fuel hose is also difficult to work with.
The reason this gets 4 stars is because of the low-quality connection of the input hose to the fuel pump. Everything is plastic except for a tiny retaining clip, rather than being screwed in place. If it is moved around too much during installation (hard to avoid with the stiff fuel hose), the clip will gouge the plastic post it sits on and fall off. I ended up losing mine inside the fuel tank and having to search for it with a magnet. I contacted Z1 about the issue, and they did offer to send a replacement retaining clip. Ultimately, I ended up zip-tying the input connector onto the fuel pump to keep it in place. If this were not done, I would be concerned that fuel sloshing around would pull it apart over time. Other than this aspect of the fuel pump design, it is a good product.