I don't have any long-term experience with them, but I've given them a good going-over in the store. (That means, in my case, putting a lot more weight and torque on them than they're actually meant to handle, getting an idea of their intrinsic stability -- I hate springy or wobbly 'pods -- and their weight. Light sounds good, but frankly things need to be heavy enough not to blow over easily.) They're not horrrible.

Let me qualify that a bit: the two cheapest are about par for the course, and by that I mean you really can't expect much at that price level at all.

The model 264 is sturdy, and the ball head is acceptable if not spectacular. I don't know how well the leg locks will hold up over the long run, but they didn't display any slippage at all when I tested them. (That's essentially holding up a photographer rather than a camera.) It's not the tallest 'pod on the market, but it's not outrageously short either. The head will also stay where you put it, but the action feels just a little grainy. But you're not going to do significantly better at that price range. If your budget only stretches to this level using your gift cards, then it's a lot better than you'd do with another brand sans the gift card value. The only real drawback (to some folks -- I actually consider it an advantage) is the weight.

The 284 (the carbon fiber tripod) is actually quite a bit more expensive than you think it is -- that price is just the legs; it doesn't include a head. You'd need to spend another couple of hundred at least to get a decent head to go with the legs. The legs might be nice to have, but if it means putting a crappy, weak $50 head on it to make it work, it won't be any better than a $100 toy tripod.