I don't have any experience with the 450, but have been using the HMEC 25KAP at work for the past three years and have been very happy with it. High quality all the way around. It is a smaller, lightweight model primarily for cockpits with fairly low noise levels. However, I plan to switch to the Clarity Aloft or the QuietTechnologies. Take a look at both of those.
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David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/21/2020
"In '69 I was 21, and I called the road my own"
Jackson Browne
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