I have both at the moment! I got the A5 as my "daily driver" and the IT01 as a gym headphone to use with a Bluetooth lanyard only a couple of weeks later. Funny enough, I have yet to use the IT01 without it's stock cable... The single dynamic sounds great. The A5 adds treble brightness and sounds wider overall, but I don't find it to be nearly $200 better. A part of me wants to throw the A5 onto the sale forum for $230 and wait for the IT04.