As a previous owner of a BeatSonic carplay module in my GX460, I installed a Hamilton unit in my new to me 2015 LX570. I have the phone echo mic issue that I need to get sorted, so I'm glad to come across potential fixes for this.
I have been working with Hamilton support for a different issue though. The screen shows a bleed across white black boxes with white lettering. For instance, in Waze, you see the black box on the left, with the white lettering often making horizontal lines across. It's not limited to that app, and it seems intermittent. I got a patch from them, didn't solve it, got another set of instructions to send them the dip switch config, then a day later after I buttoned it up, more instructions to flip some dips and reset them again. I'm becoming increasingly frustrated with Hamilton and I'm considering returning it in search of another solution.