Bonvicini, G. JACoW Publishing Geneva, Switzerland The LABM is a set of four telescopes pointed to the SuperKEKB Interaction Point (IP). It measures large angle beamstrahlung in the visible range, providing both polarization and spectral information. The experience with the LABM during both Phase I and Phase II is reviewed. It is shown that large angle beamstrahlung has been observed, and beam parameters are preliminarly extracted from the measured yields. The measurements during beam-beam controlled oscillations are also discussed.