With T56 series here the 48s dropped down to $170 range, everything else has gotten even cheaper.
The t56a is the cost that Yealink 48s was a month ago, and it is android. About $199.
I got Ubiquiti phones in to test and have updated them a couple times. At last pass they still couldn't park or use BLF reliably.
I can't imagine leaving Yealink.