My biggest concern would be overall reviews.. you never truly know what your dealing with when it comes to certain products (like vapes) until you get your hands (and mouth) on it.. check the reviews everywhere you can find them, take em all with a grain of salt. Then, when you think you're happy with your choice? try to debunk your decision and search for whats WRONG with it. Common problems, customer service issues if something goes wrong, replacement part costs, etc. Thats how you find a winner