It's a very board-like string, since it's super firm. I don't like how that feels, but I love how I can confidently hit super sharp angles with it (and actually make the shot)
In an 16x18 string pattern, it gives it impeccable placement relative to ALL other poly I've tried. In an 18x20 pattern, it's an imperceivable difference. In a Blade 93, I couldn't tell a difference in power/placement between gut/ALU and gut/BHBR (I did a side-by-side comparison once. Fresh strings on both. Identical setup) In the BLX90, gut/ALU was the superior setup, compared to gut/BHBR, gut/Black magic, gut/tornado, gut/hurricane, gut/SPPP, and a few others I forget.