for several months now. It's a great tool for analyzing the swing. I had an 8GB SD card lying around that I use in it, although you can get 16GB for a reasonable price (<$40) and a 32GB card for a lot (>$100). Looking at some of my videos, 30fps is about 1MB per second and the 210fps is about 5MB per second (less than the 7 multiplier you'd expect, mostly because the quality is somewhat less at 210fps.) I haven't fooled with the 420 or 1000 FPS as 210 is adequate for my needs. Doing the math, this equates to about 2 hours of video for 30fps on an 8GB card or 30 minutes of 210fps video. Since the 210fps is generally shot swing-by-swing, each swing of 210fps seems to consume roughly 10-15Mb depending on your endpoints. This means 500-600 swings per 8GB card. It's not a bad idea to get a high-speed SD card, although my 2 year old 8GB card works just fine at 210fps.
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