Looking at it, the Idem Key is quite identical to most other FIDO2 security keys, albeit this key has a slightly contoured design on the top and is of slightly larger dimensions. Same standard exposed blade, same capacitive touch sensor depressed into the top of the key. The key has a led light under the sensor; overall quality feels high.
The only spot I would mark it slightly lower than its competition, the blue LED is not necessarily noticeable when plugged in. It might seem like nitpicking, but when all the keys are so similar, the trivial things are what you notice.
Available Features And Management
Along with FIDO2, it supports FIDO U2F and certificates to be used as a smartcard.
FIPS 140 Availability
This is one of the two keys tested that is FIDO Certified Authenticator Level 2 and is FIPS 140-2 compliant.
Enrollment And Usage
The key enrolled in Azure AD without issue.
The key worked consistently after enrollment without issue.
The key was factory reset without issue.