Crashpad uses Microsoft's minidump format as it's standard cross platform format, I believe. Maybe it might have better tools, but I've not had any dumps submitted yet.
Microsoft's system is not totally bad, it's just not very comfortable for everyday use. You need to copy your symbol files from the original build and store it somewhere. Then, as you receive a dump, you need to copy it into the directory where the symbol files went (along with the original source code). Now if Google Breakpad automatizes this process just a little bit, it would already be a great improvement over the old system.
I have received several crash dumps from various people so far, but that never actually worked for me, so now I ask people to send me their saved games instead. Saved games always load smoothly for me, and if they don't, I can fix it in a minute. And they don't require any f***ing symbol files. However saved games not always allow you to find the bug. Sometimes you just can reproduce the crash with the steps provided by the reporting player, or you don't receive any reproduction steps at all. So crash dumps would be a great complement (if they really worked).
