I just got them, so this is a provisional review.  They installed effortlessly; I did use some gardening wire to connect them side by side for added stability.  They're doing a fine job of keeping rabbits away from a low raised bed of dahlias.
What I don't know is how the wood holds up in the ground for 4 or 5 months.  They're not pressure-treated, nor are they redwood or cedar, so their spiked bases may rot by being buried in dirt for the growing season.  I'll report back then.