i was able to grab one from ebay for ~$1250 (I think I was lucky on the price, as it's still a current generation switch from netgear's pro AV line, and retails for a little above 15K).
I do a lot of network engineering, and have always liked netgears' managed switches for edge devices. They are well made at the PCB / component level, They do not block firmware releases in any way, and they do not do licensing. Parentheses ie if the switch is capable of it the software supports it from day one).
I do know in terms of audio / video production, audio and video engineers ive come across swear by Netgears AV line of switches, mainly in terms of NDI video , Dante audio or other IP based stage/content production type protocols (as well as multicast usage by the protocols).
I plan on using this switch at the top of my home rack, prior to finding this deal on ebay I planned on buying 1 or 2x of the mikrotik 25/100gb switch: CRS510-8XS-2XQ-IN (which ONLY uses ~ 27w idle).
while this switch is overkill for my use case, I will be running 25GB and a 100GB to my vmware / free nas hardware (truenas).
One annoying thing about this about the m4500 line, for some reason netgear does not publish these switches idle power draw and sound levels, I can tell you from my own testing it's around 127 watts idle and 50 to 55 decibel sound level (pretty quiet for this level of switch!) - NB: this is with both PSUs connected to mains, and NO OPTICS connected at all. so totally idle.
will update in a few weeks when i start To see compatibility with various optics / DACs. ask if have any ? about it