I concur with others: mStand is the best alternative. It's hugely sturdy, which is a real plus when trusting the stand to support an insanely expensive laptop.
I actually travel with my mStand and Magic Keyboard and Trackpad; they go in my suitcase or in the trunk of my car on almost every trip I take.
I have tried most of the 12 South iterations and come back to the mStand each time. The Roost stand looks really nice, but also spindly.