Checked from CamelCamelCamel seems to be the historical low for those cards:
1TB version now $607.99, was around $1100, camelcamelcamel link here
256GB version (Sold Out) now $212.99, was $400, camel link here
128GB version now $151.99, was around $230, camel link here
Those cards have max read speed ~1700MB/s max write 1400MB/s, min sustained write 140MB/s for 128GB one, 300MB/s for 256GB one and 400MB/s for 1TB one. Do they have good value camparing to Angelbird 512GB AV PRO CFexpress 2.0 Type B SE Memory Card which are $278 now from Amazon Au? It provides maximum read speeds of 1785 MB/s and maximum write speeds of 850 MB/s, as well as minimum sustained read speeds of 1785 MB/s and minimum sustained write speeds of 800 MB/s.
I’ve got one of the AngelBird SE cards and it’s great, and 800MB/s is more than almost any current use case (I think there is a RED in one of its 8K modes that exceeds this).
Works great in my Canon R3, R5 and C500II.
Considering two 512GB AngelBird cards are cheaper and faster than this, I’d be purchasing AB again.