First of all these windsurfers aren't gold plated, they are copper. I just wanted to clarify that since folks here are talking about "gold". Copper looks cool, but it's no more efficient than aluminum, according to RF GUY in this forum, he's an RF antenna engineer. I believe his opinion. I've tried aluminum and copper both, and they both work the same from a range comparison point of view. What's more important according to RF GUY is the shape of the parabola. Ideally he says the surface of the parabola needs to be 2" from the antenna, but that's impossible due to the antenna spacing between both antennas, and the available space behind that conflicts with the tablet and holder. There are a few windsurfers in the market that position the parabola too close to the antennas, about 1/2", Kman has one of these and I happen to see it March 26 (don't ask me why I remember the date). The better ones have more space, about 3/4" between antenna and dish surface.
The folding model on amazon is spaced at about 3/4", and the convenience of it folding like a clam shell is great for storage, not to mention it keeps the antennas parallel when in use, which helps. Windsurfers offer the most value for range extending, they work well. My range is almost doubled on my P3P. However other antenna options can work better, at a higher price money-wise, ergonimic-wise (harder to store), voiding warranty on the RC, and the fact the radio is always a directional antenna setup, no more omni-directional flying, which is an advantage of the windsurfer. Just slip off the windsurfer, presto, omni-directional. As for the P4 RC, windsurfers aren't as effective as P3P due to the lower RF power from the P4 RC. Windsurfer does help P4, but not as much, compared to P3P.