Strother Bullins of ProSound Network released a comprehensive review of the MTP 550 DM live performance microphone.
Summary: "In my own field tests, the MTP 550 DM performed alongside competing models from AKG, Sennheiser and Shure quite well, even compared to some that sell for $50-100 more.
[...] In one particular outdoor application, the MPT 550 DM was the best of a four-model dynamic handheld array in resisting strong, whipping winds while in use. The mic boasts a notably road-ready build quality, too; it was dropped a number of times (from nearly six feet to concrete) with nary a scratch inflicted.
It’s clear that CEO Perschon and the LEWITT team spent a considerable amount of time crafting the MTP Series’ fit and finish; these attributes allow it to be considered alongside those world-class, ubiquitous handheld dynamics that we all know, love and depend upon."
Conclusion: "The LEWITT MTP 550 DM is a great example of a 'workhorse' dynamic cardioid handheld microphone featuring a hearty build quality with obviously high-grade shock mounting and materials throughout and an overall pleasing sound, all for an affordable $119 street."