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I have used the plastic spirals, but once they get dirty its impossible to tell what colour it is from any distance - i won't be bothering in the future as wiping clean the bands almost every day is not something that is high on my priority list.
CT
I like the plastic spirals, but nothing is perfect, The birds will get a toe in them and either break them or pull them off.
I use the ones you are asking about because they meet the standard requirements for NPIP. They are numbered, supposedly non-removable, and can be bought in different colors and sizes. They too are not perfect, I find many of them on the ground. You really have to be paying attention when setting the band.