That's IDA, the interactive disassembler. The free version's not too bad, but if you're doing any work with 64bit, you'll need the pro version, which is a fairly hefty sum (at least for a student like me).
The free version is also x86 only.
I'd recommend using Hopper as a hobbiest.
Agreed, I have high hopes for Hopper.
And Ilfak (the creator) refuses to provide special student pricing (even when offered proof of identity). I was willing to spend many hundreds of dollars for a student license but instead settled begrudgingly with objdump. Perhaps it is because Ilfak is so paranoid about leaks/piracy.