I have to say that my setup is entirely based around having this type of wing. So when I remove it, my truck handles horribly. However, when I've driven someone else's truck that has a "normal" spoiler setup, I find that it doesn't suit me.

With wing

Pros:

1. Incredibly stable on long fast straights (If I hit a loose spot, etc... I can correct and still keep it pinned).
2. Incredibly stable while jumping (It's tough to get off axis even off of large jumps).
3. Allows me to be less than perfect while using my jumping technique (pinned to base of jump, coast up ramp, power on immediately after landing).
4. Massive amounts of traction in fast areas, and increased traction on slower areas.

Cons:

1. Requires a different jumping technique if you don't offset the weight somehow because the truck becomes tailheavy (almost two ounces in total, but this can be offset with a lighter battery and/or motor).

With stock lexan wing

Pros

1. Truck can probably achieve a higher top speed (I have nothing to support this).
2. Slightly easier to change pitch angles in flight.

Cons

1. Easier to lose traction in corners.
2. Less stable everywhere, but especially on fast straights.