What does the company do well? The experience with Trello is very pleasant, there are no difficulties when using Tello. Make a project is very simple and pleasant to do if you play with this program.
What does the company not do well? They do less some options to personalize, the ones they have are not bad but when you use them for a long time they become tiresome and over time limits your work.
What do you wish you had known about the company before using? The fact that personalization options become so limited is a point in disfavor, but neither does Trello make a bad program, since everything else compensates for this small detail.