Okay, so first up: Dark Magic without.
It is a good yoyo, a couple dings, and almost no vibe. It just feels like a little hummm…
With synergy caps:
Instantly, a wobble. Nothing you can feel, feels the same, but it just has a wobble that cannot be corrected with a finger. This does not affect my play, but it is a bit disturbing to see. The thing I wasn’t expecting, but should have, was the weight. My dark magic was instantly heavier, which I liked. However, the weight slowed me down a bit, and kinda threw me off. I’m getting better. Sometimes I hit the synergy caps with a whip, if so, instantly my DM turns in a circle, and I have to drop the string and try again, kind of annoying. The caps kind of reduce the looks of my dark magic. I have a black, so black on black = good. However, if you have a green… The caps was blocking part of the metal, the innermost metal in the dark magic, which I didn’t like. I like the looks of that inner metal.
The good things about this: Obviously: The caps!!! I can hold it flat on my palm now, and people looking at me are surprised. I can hold the yoyo, pull start it, and wind it without a bind. (It involves giving the yoyo slack, lots of it, with the string vertical.) The caps are fun.
The weight: If you have a speeder, obviously you can add this in for a bit more Dark Magicy kind of weight.
So, for only $8, I would say it is worth it. The fact you can hold it, for nothing but looks and a slight wobble in the bargain is great. If you don’t like it, you can always take it out, unlike a hubstack, where the center post will always be there.
All in all, considering the price, take out ability, and the performance, I would rate it a
10/10. You might say it doesn’t deserve that, but the price of it is way under the price of stacks, and the performance is only a little compromised. You can remove this, an advantage over stacks.
Edit: The caps stick out. I don’t think you can do this with stacks. This lets you put the yoyo on your palm horizontally, and on the table. Just a FYI.