I am a Trello longtime user (maybe from around 2012) and I really enjoy this application.
I have installed in all my device (ipad, android phones) and uses it also everyday in browser mode.
At the beginning, I had boards for professionnal and personal matters but years after years, I use Trello mostly for personal matters. I have shared 1 same board with my spouse for year. We write on it every common cards that concerns our common day life.
The reasons why I use less in a professional way is that I didn't succeed to spread this love for Trello to other members of my team (in my software company, we already have other official tools) .
What I really like in Trello is that we can manage nearly everything through simple and clear features. Sharing board with other people is also a key point (I really enjoy to see when there are new lines in Activity section that are added from someone else than me, that makes me feel that things are progressing).
In simple words, I just want to thank the whole Trello Team for all this.