As far as fast blades vs slow blades vs medium speed blades: here are a few thoughts.
Any blade and blade speed has its benefits and its drawbacks.
When you have solid technique, a fast blade feels manageable and it honestly doesn't feel that fast.
The most obvious advantage to a fast blade is that, well, it's fast.
There are two places where a fast blade can have drawbacks.
1) for a developing player whose technique isn't fully formed, one of those ultra-fast blades could hinder and/or slow the players development of heavy spin. The reason is reduced dwell time and feel. But some kids can still get away with that.
2) The faster the blade, the harder it is to get the ball to arc, just past the net which reduces your ability to get wider angles on your shots. If your technique is good enough to get the spin to get the big angles, there is no downside.
The upsides to All+ & Off- all wood blade.
1) for a player developing technique, these blades, because of flex, feel and dwell time help a developing player learn to spin better and learn to spin earlier in their training. They also make a developing player have to work a little harder for power so the technique of weight transfer and use of legs, hips and body happens faster and the player develops the muscle memory of a fuller swing sooner.
2) for a player who is decently well developed, these blades help you get more spin and make it easier to get bigger angles.
The downside is, it makes it harder to get pace and put the ball past a high level opponent.
Blades in the middle of "ultra-fast" and kind of slow, like a Viscaria, are:
They do have decent dwell time as a result of the Arylate carbon mix. They are fast enough without being too fast. So, if your technique is solid, you can do everything that a slower blade does decently well and you have the obvious benefits of the blade being reasonably fast, fast enough.
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