The HA-2 I thought was way worse than Mojo, it's why I switched. Guitar distortion in particular sounded awful in comparison. Like I find a lot of dac amps are somewhat subtly different where I'll hear the difference but it's not like one sounds unusable. That difference was so large it sounded like something was wrong with the HA-2 even though I'm fairly sure that wasn't the case. Haven't tried the iDSD BL obviously, but I may at some point.