I recently purchased the XLT Communications SM100-MT speaker/microphone to test while bike riding in a large group (45 of us), all with varying degrees of speed. Overall, I was highly impressed by its performance. IMO, it sounded better than the speaker on the Motorola T9550 itself. And it was perfect to clip onto my backpack so it was right there when I needed it.
Buytwowayradios shipping was fast, efficient, and the support team communicated with me all along the process. all in all, a solid company and look forward to buying from again.