The HackRF is a solid, if slightly dated SDR platform. There are plenty of better SDRs out there, but none of them are as ubiquitous and well documented/supported, particularly in the hobbyist space. And none of the better specs of other SDRs matter that much unless you need them, and you'd probably know if you do.

If you're just getting into SDR, I would just get a $20 RTL-SDR, and then move on to something like the HackRF or BladeRF later.