I use these on my cyclocross bike so I can clip in for some serious riding or just hop on it in street shoes for a quick trip in the neighborhood. I find the SPD side to be reliable and easy to clip into and the platform side offers a solid surface to use for regular shoes. I also installed them on my trainer so I can jump on it when I have to stay indoors.
I ordered these pedals to ride on snow and ice using my studded tires. By not having to clip in, I have felt more secure using these pedal on difficult ice. When there isnt any ice or th ice is smooth I can clip in and ride with more efficiency. I am very satisfied with these pedals.
I put these on my daughter's bike. She typically rides clipless in the summer and platforms in the winter with studded tires on our icy roads and trails, or occasionally platforms with casual shoes. These save me a few minutes of pedal changeover a few times per year. I originally bought them for my commute bike, and I'll probably order a second set soon.
Disclosure I've been a roadie for 2 decades, and only added MTB this spring and this is the first set of lipless pedals on an MTB I've ridden.
I really like these pedals. They were inexpensive, and they work as advertised. I like being able to adjust the difficulty of clipping inout, and the flat side of the pedals is sufficiently grippy. I've never had any issues clipping in without looking, as my shoes seem to easily clip in. My only minor complaint is that I wish the flat side of the pedal were larger. However, that is likely due to having size 13 (48) feet and being new (and less comfortable) riding MTB than road and wanting a wider platform.