I have, yes.
Overall the savings were fairly minimal, you're only saving on the power supply costs, NOT the distribution costs, taxes, etc.
Then at one point I got a letter from one of the companies because I switched too soon to something else that I owed them $50 or $100 because I didn't stay on their plan long enough. I tossed that letter, and never heard more about it, but the whole thing just became more of a hassle than it was worth to me.
For me, I determined I could get the same overall savings just by replacing a few bulbs with LEDs and similar things.
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