Low Rush is Rush dropped about a millimetre: same round flat tip, same ten gears rather than the twelve on Flat and Low Flat. The tip is narrower than Flat’s, so it generates less floor friction, but still bites enough to climb onto the X-Line reliably. Ten gears mean the bey rides the rail more slowly — weaker individual dashes, less spin spent on each, and therefore more of them across a match.
Where it separates from Rush is height. Sitting lower puts the contact points closer to the opposing ratchet, making Low Rush the better burst-attack option of the two, and it is more burst-resistant itself. The cost shows up against noticeably taller opponents, where that low stance makes it easier to destabilise.
It is a genuine competitive pick and among the safest attack bits to launch hard, since the reduced self-knock-out risk lets players commit; anyone wanting the same behaviour at standard height simply runs Rush. Wear is documented and worth planning around — repeated rail contact chews the tip and gears, and the indented perimeter shared by every Low and Under variant is prone to cracking, so spares are standard practice.