We need something to go under our butts in the cockpit, and something like those "Sport-a-seats" are just the ticket. My options: buy the name brand sport-a-seat for $100 a pop, plus shipping, or go with the West Marine knock-offs for $65/each. The West Marine variety seem perfectly fine for what we want to do with them, but the sport-a-seat websites warns me to "beware of cheap immitations!". I don't really care if they're made from Sunbrella---when we're not using them, they're not going to be in the sun, and when we are, they're going to be nicely shaded by our bums. Any reason not to go with the West Marine version?