Mark Wilson, K1RO, reviewed the Heil Sound BM-10 headset in the February 1992 issue of QST (pp 67-69) and the original Pro-Set model in the January 1992 issue (p 77). Mark found the Pro-Set an excellent performer, both for listening and talking. Both of those units are still available from Heil. The original Pro-Set was available with either the Heil HC-4 "DX Dream Machine" element, designed with a strong mid-range for maximum DX or contest "punch," or with the HC-5 "full articulation" element, designed for everyday operating with a more balanced natural sound.
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