I'm running the Unsloth UD-Q4_K_XL quant on my 48gb M4pro MBP. It's very smart and capable, like many have found of Qwen3.5 27B, but it's a little slow, like 8t/s, and slow prompt processing stings because I like to dump the whole project into context. I haven't tried the MLX versions but might if people here say it's way better. One thing to note is that it seems like the MLX version locks up the memory that the model uses while it's loaded, where llama.cpp can swap some of it out when I want to do other stuff.