I have being with dodo for many years purely due to their prices. I haven't really had any issues with them before and they have been good.
Pros
-cheap prices
-reliable
-helped me get out of a contract by paying a lesser fee as I felt I was pressured into signing up to them for a 24month contract

Cons
-calls from different dodo people who then apologise due to ringing about the same thing that was dealt with the day before (has happened a few times)
- the constant phone calls and pestering when you want some time to think about the plans
-nbn prices were disappointing compared to other telcos hence me changing over to another one
- some congestion and slow speeds every now and then

In conclusion I did enjoy using dodo for my adsl for many years due To the affordability and felt like i was worth the cons at the time. Unfortunately the NBN plans were a let down and they tried to sell me thier $64 plan to me at the same price saying it was a deal made just for me as a long term customer (which annoyed me) so I am no longer with them.