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We show that a recent claim that matter wave interferometers have a muchhigher sensitivity than laser interferometers for a comparable physical setupis unfounded. We point out where the mistake in the earlier analysis is made.We also disprove the claim that only a description based on the geodesicdeviation equation can produce the correct physical result. The equations forthe quantum dynamics of non-relativistic massive particles in a linearlyperturbed spacetime derived here are useful for treating a wider class ofrelated physical problems. A general discussion on the use of atominterferometers for the detection of gravitational waves is also provided.Comment: 16 pages, REVTeX4; minor changes, one figure and a few references  were added, an additional appendix was included where we explain why,  contrary to the claims in gr-qc/0409099, the effects due to the reflection  off the mirrors cancel out in the final result for the phase shif

Gravitational wave detectors based on matter wave interferometers (MIGO) are no better than laser interferometers (LIGO)