I have 2 envy pros, 1 element aluminum, and 1 element magnesium. I love them but the aren’t for everyone. If you don’t like pistol grip/AR type ergos you probably won’t like the Xlr.
The XLR chassis are very well built and I personally have come to really like the ergos and ability to add or subtract weight depending on what I’m doing with the rifle.
I feel that my magnesium chassis is a little more flexy than my aluminum element. Unless I was going for ultimate light weight I would save the money and buy the aluminum version.