I used it for a while and stacked slightly more than if I had just bought the sats at market rate.

But the math (at that point) was unless you were channelling $800 or more through the card each month it wasn't worth the fees and you would end up with net fewer sats.

And then they started diluting the spin wheel to make it financially viable for them to support, so I imagine that number is higher now.

You would have to do some napkin math to figure out if it's worth it for your particular circumstances.