I used to leave the flats in aswell, once I changed them with concaves the yoyo became less tilty and thus more stable
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I’ve been playing flat bearings lately. Not sure why now but while I know there’s a difference between the 2 and how they perform, right now it’s seeming marginal. Half the time when I’m throwing, I forget what bearing is even in it. Perhaps this is a good sign?
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@G2_Jake explains one of the benefits of flat bearings in his latest tutorial. They help keep loops open in suicide tricks.
I know first hand that delrin axles are a bad idea.
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I know it too, or rather, it certainly does not improve, the yoyo becomes a little more “slippery” on the return but still does not compromise its playability.
At least that’s what I noticed, due to my lack of experience, as I don’t particularly like playing with fixed axis yoyos.
Basically I was continuing the joke of yoyospirit 
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It is logical that the execution of tricks that require various passages of string in the gap are facilitated by a flat surface such as that of the flat bearings, so that the various portions of the string side by side rather than overlap as happens in kk (and worse in those with V profile) but there is also the disadvantage of moving towards the response area with consequent friction.
I personally find central-tracks or flat-grooves as the best solution.
Aka the only benefit imo
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Our quarterly concave v. flat bearing argument, joyous day!
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This is like the 1980’s Miller Lite commercials with the “Tastes great!” crowd always being adamantly against the “Less filling!” crowd. I like to think no one is really getting wrapped up about this, except the people who are looking to place top 10 in any contest they are competing in, who need to extract every bit of performance from their yoyo. For me, I play yoyo to relax. I do have preferences, but, I have yet to find myself disliking a yoyo due to its bearing.
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