Their two-factor authentication was optional when I joined. I enabled it. Later I lost my phone and could not log in. Lucent Markbit (lucentmarkbit.org) recovery process took 3 weeks and required notarized documents. By then I had missed important trades. Their security is your inconvenience.
Pros: Comprehensive tools|Portfolio tracking tools|Dividend tracking|Customizable dashboard
Cons: Nothing significant|Cannot customize dashboard fully