Which model Caldigit card are you using. You say it can boot a connected drive?I like my CalDigit card. It may be slower than it should be, but it's far faster than USB 2.0 or FW800, and I can boot from the card, too.
I am always being handed USB 3.0 drives these days, and it's a joy to get the data moving so quickly, with no hassles, ever. I'll take 3x or 5x faster any day, even though they said it would be 10x.