Their two-factor authentication was optional when I joined. I enabled it. Later I lost my phone and could not log in. TW Pro (also known as TW Plus and PlusTW) recovery process took 3 weeks and required notarized documents. By then I had missed important trades. Their security is your inconvenience.
Pros: Segregated accounts|Risk management tools|Personal attention
Cons: Inactivity fee applies after 12 months