Decompilers wont give you the EXACT source code of a binary, they will give you an aproximation, which quality will depend on the compiler used and what optimization flags were used. I have got results from a REALLY good decompilarion (~90% like my original code) to total garbage (I mean, reading ASM was easier than the decompiled source).
The best decompiler I've used is X-Rays (IDA), and most of the times it actually helps to understand large chunks of ASM code.
I have not tried this one, but judging from Axon's description and screenshots in its website, it seems like "more interactive". You constantly modify the decompilarion until you get a decent enough source, instead of letting the tool do all the work for you. Seems interesting, I'll try it.