There was a DP review thread and someone brought up that the old Spyders (5 and older) had a gelatin lens?? Supposedly updated in the X models but they don’t say exactly how and apparently they degrade due to moisture if still using gelatin…I don’t think it was resolved even though a datacolor rep responded in the thread he would just keep replying that it was updated…X-rite states their lens is glass…so I can’t attest to the truth of this but from what was contributed only X-rite provided clear technical specifications for that component…if you buy X-rite make sure you buy at least the pro as it will work if you have hardware calibration in your monitor…I don’t think the Display Studio basic one will…again I’m no expert…but tidbits to check out…
This site is one of the best I have found for videos and information around this subject… https://www.youtube.com/c/ArtIsRight/videos