What do you like best?
*The really intuitive Desktop version.
*Wonderful plugin for sketching different kind of devices likeAndroid, Blackberry, Nokia, TV, IPhone, IPad, Windows Phone 7 (and for Facebook, Fireforx OS, IOS, Windows 8, Sharepoint, Bootstrap and more) which can be downloaded for free!
*Is pretty simple to find a control because they are visible, are grouped and Balsamiq has a search tool.
What do you dislike?
*Somewhat poor interaction (but it's a Lo-Fi tool then it's an obvious thing).
*Sometimes controls doesn't have enough properties (then I can't use the "better" (more adequated) control because it doesn't have the interacions and properties I need).
*The online version is more complex and less user friendly.
*I think using a .BMML file for plugins is bad, it would be great if the plugins were REAL PLUGINS (download, install and you can use them easily) not mockups.
*I think Balsamiq online is somewath expensive, the Desktop version has a better cost-benefit ratio.
* Balsamiq has limitations about design (typography, controls' appearance, etc.).
*If you have a Linux OS, you can't use the Desktop version.
Recommendations to others considering the product
Balsamiq is a wonderful tool for EARLY stages, please consider to switch to another product for Hi-Fi prototyping.
If you need many complex interactions, Balsamiq is not for you.
What business problems are you solving with the product? What benefits have you realized?
I'm using it for Sketching and Lo-Fi mockups.
Being like a draw BUT with some interaction, it's really useful for ideation and flow's evaluation.