Built into an extremely rugged weatherproof case with carrying handle
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Flyer speeds over 1500 rpm
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Onboard tachometer
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Remote pause/start control (not necessarily foot-operated)
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Range of flyer and bobbin choices
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Compatibility with other wheel's flyers
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Onboard rechargeable batteries
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Interchangeable batteries that are widely available
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Internationally-compatible power supply
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Noise level when spinning
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Range of takeup adjustments from "almost none" to "very strong"
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Ability to customize appearance with color selection etc.
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Warranty options (eg one year full, ability to extend, etc)
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Ability to buy direct from maker
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Ability to buy from a dealer network
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Customer service and support options
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Upgrade options and continuing development of new features
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Backwards compatibility so new features can be rolled out to earlier e-spinners
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Appearance or Styling
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Sound and Vibration Dampening Features (specialty feet, acoustic foam, etc)
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Ease of maintenance (like routine oiling)
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Ease of common in-the-field repairs (like replacing drive bands, brake bands, etc)
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Ease of less common in-the-field repairs (like adjusting pulley positioning)
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Comes with tool kit for common maintenance and adjustment tasks
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Availability of replacement parts and consumables
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Unboxing experience
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Quality of documentation and manual(s)
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