Even in the EU, returns can be a pain if you buy from a seller that doesn't follow consumer laws.

• Seller's contact info: Does the online store list a physical address and phone number? If not, avoid them.
• Return policy: What happens if the product arrives defective? EU law gives you a 14-day return window for online purchases, but some sellers are slow to honor it.
• Warranty: Does the device come with a warranty? If not, think twice.