My first plate shoes were the mu450’s and I wore them for almost 10years. They started off fairly heavy, but very protective, and when I hung em up in the garage, they had gained weight -lol.
I replaced them with the mu460’s v1, and sincerely, I think you would be happier and likely more successful in finding the 460s. If you can find em, the 460’s are going for $80-$90.
The 460s are quite a bit lighter, and more comfortable than the 450’s.
I am not a huge fan of the 460’s v3, estetically, but they are the latest and greatest available.
Good luck in your search.