First and foremost I love that this product is open source and available on github. So, you can be rest assured that this product truly caters to their clients.
Secondly, the admin interface is easy to use and contains in depth incoming crash log data. Moreover, there is a script that sybolizes crashes on the database, which makes it much easier for a developer to see crashes.
Thirdly, there is automatic grouping of crash file. So, you don't have to waste time manually organizing your data!
Lastly, the program itself assigns bugfix version for every crash group and define a status for each, augmenting the efficiency of this program.
Unfortunately, you cannot attach custom logs. So, it's quite rigid in that standpoint. Regardless, people have raised this issue in the github repository and they are working to include it.