Some readers have expressed interest in this comparison. I own both kites. I bought them with my own money and I am not sponsored by anyone. I weigh 180 LBS and I have been kiting for 6 years on the snow and water. I have owned a lot of big kites over the years (Naish 17.5, 21.5, 23.5 ARX, Wipika 16.4 Airblast, Flysurfer 16M MastAir, 17M Psycho, 18.5 Titan, 21.5 & 26M P2, Gaastra Phoenix 25M, Naish V4 30M). I am not biased towards LEI's or foils. I like kites that work well in a variety of conditions.
This is an initial review. I have flown the Waroo 20M 3 times and the Silver Arrow 6-7 times.
Today, I flew the kites back to back. The wind was light (12 - 14mph) with gusts of 15 - 18 mph. I rode on a 149 SS Glide.
These kites are very different, but they are both well-engineered and each has some interesting characteristics. The Silver Arrow is a special edition of the Flysurfer 17M Speed. The difference is the fabric that is used is much lighter in weight. A Speed 17M kite including the bar, lines and kite weighs 4.2 kg compared to 2.7 kg for the Silver Arrow.
Launching/Landing - the Silver Arrow has the advantage as all I had to do was weight down the trailing edge, unwind the lines, and straighten the bridles. From previous experience, I found that the kite requires no pre-inflation in wind over 10 mph. The Waroo was also pretty easy to setup and launch. Landing is another story, the Waroo was a piece of cake to land, while the Silver Arrow still generated a lot of power with the blue safety line pulled. Flysurfer needs to come up with a better system for this kite.
Turning - the Waroo turns faster and since it has a shorter length it is better for kiteloops. Downloops have to be initiated high in the sky with the Silver Arrow if you don't want to drag the tip of the kite in the water.
Power - the Silver Arrow generates more static pull, but it is more of a park and ride type of kite while the Waroo turns fast enough that it can be sined in light wind to generate speed. I think the Silver Arrow would get you going in a knot or two less wind than the Waroo and it generates more power once the wind comes up. Both kites go upwind very well.
Jumping - both kites jump well. The Silver Arrow is more interesting because the jumps are more floaty. On a good jump, you sometimes feel like you are just hanging in the air. I have had this experience with the large Flysurfers on the snow as well. Maybe PMU can explain it ?
Range - I have not tested either. However, based on my experience with a 16M Waroo, I am almost certain that the 20M Waroo has more top-end.
Gusty conditions - The Waroos are excellent in very gusty conditions. I did notice that the Silver Arrow handles remarkably well in the gusts due to the lightweight fabric. Rather, than folding or falling the kite seems to just hand there. Another advantage of using lightweight material. Makes me think that all sizes of foils would benefit from using a lightweight material, especially for use on the snow as mountain winds are less consistent and variable compared to wind over water.
Price - The Silver Arrow is around double the price of a Waroo.
Which kite should you buy? If I were only using the kite on the water, I would consider a Speed 17. You can pick up a used Speed 17 for a little bit less than a 20M Waroo. If you are looking for a kite for both snow and water, the Silver Arrow is very enticing. Overall, I personally prefer the Silver Arrow, but it is a close call and I may change my mind once I have had an opportunity to fly both kites more extensively.