Opinions on the aesthetics of a tail tidy or any aftermarket modification can vary greatly from person to person. However, many riders find that a tail tidy enhances the overall appearance of a motorcycle, giving it a cleaner and more streamlined look.
In the case of the 2017 KTM Duke 390, which already has a sporty and aggressive design, a tail tidy can further accentuate its sharp lines and compact rear end. By removing the bulky stock fender and relocating the license plate and turn signals, a tail tidy can create a sleeker and more visually appealing rear profile.
Ultimately, whether a tail tidy looks good on a 2017 KTM Duke 390 is a matter of personal taste. Some riders prefer the stock look, while others appreciate the cleaner and more customized appearance that a tail tidy provides. It's recommended to look at pictures or seek out real-life examples of the modification to see if it aligns with your aesthetic preferences for your bike.