First, ask if the product actually fits your needs and the local rules.

• Nicotine strength: Does the product's nicotine concentration comply with local limits? The TPD caps e-liquids at 20mg/ml, but some countries have lower caps.
• Tank size: Refillable tanks can hold a maximum of 2ml under TPD. If you prefer bigger tanks, you might need to import from outside the EU, but that raises compliance questions.
• Device type: Some countries restrict certain devices (like disposables). Make sure the device you want is legal where you live or travel.