Hi rob2121,
A forum search on Aloe Alexis (you can just click this) will bring up more information and feedback from many members that have purchased it.
A forum search on Flexia only brings up a few mentions of it but none of them are from someone who owns it.
A forum search on featherlight also brings up a few mentions of it but again none are from a member who owns it.
Hopefully some of the members here that own one of these mattresses will see your post and share their comments and feedback about their mattress.
I should also mention that the Alexis has a wool and polyfoam quilted cover which can change the feel of memory foam compared to sleeping on memory foam directly (see post #12 here about quilted covers)
Phoenix