Had 450 and was madly impressed. Switched to 350 for more portability. Slightly less noise-cancelling, but my biggest issue is that it's not compatible with a Bluetooth connection. Doesn't always connect. Writes that it is connected, but it is not, there is no sound. And doesn't always turn off unless I plug in the charging cable like I'm resetting the connection. This is wrong. The 450 was very reliable.
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