If you own a product personalization business you can get benefit from an online designer. To begin with, you should look for a solution based on the type of product. Designer with one-side support works well for decals, signs, or banners. What if you want to offer to personalize 4 sides of a uniform (i.e. front, back, left, right)? Or what if you offer to customize all 6 sides of a gift box? With a one-side designer, you would have to show different sides of your product as separate items. That would be confusing and frustrating for the user to work with the designer. In such case support of multi-sided products becomes one of the key criteria of your choice. Simple switching between sides and instant preview of any changes will help customers not losing their design of front while working on the back design of some product.