I have been using this for about 6 months in a small 2 bedroom apartment. I love it. Surprisingly stable for something that just leans against the wall. I have never had an issue with it and most days I ride my bike taking it off and putting it back up.
I call this “fair”, not great. Much better than the one-pole version, which I would not recommend.
The amount it needs to stand away from the wall for balance is a good few inches, so a narrow roadbike would lean against the wall in less space.
This does buy you the one-over-the-other advantage, however.