The UR22mkII works very well, when it is working, it drops (most likely a Yamaha driver issue on the Mac) and then you move it to another USB port and it works for another 30 seconds until it drops again then you have to reboot the Mac to get it to work again. But it is so awesome when it is working LOL, I hope they fix this soon or I will buy a better external sound system and never buy Steinberg again. So disappointed, never in my audio career have I had so much problems with an audio interface, It worked for a while when I first got it when it first came out then Mac updated the iOS and Steinberg UR22mkII never worked properly again.