In theory I like it. But in practice it doesn't work for me and I don't sit in it if I can avoid it. (Same as the long-haul A330 configs I think 33K and 33E, and the 77G/K config). The reason I don't is I've had too many times PEY/Y pax treat it as their toilet, making the aisle more bustling than it should be and kinda defeating the private nature of the cabin. I've also had more than a few cases with self-upgrading passengers, although to be fair this is very rare and each time passengers have been sent back (I bet I've seen it 5 times out of maybe a hundred flights or more. Always on 35G/33K/33E/77G/K though). This is really annoying on 77G/K where the door swing open into the minicabin itself, but I still don't find i get the privacy id expect in theory from the minicabin on these configs.

ALso the crew don't work out of the rear galley which is good for noise, but bad for service if you care (a minor issue with CX overall, given how responsive they are for the call bell. But esp on regional flights I think it helps to be closer to front galley if you want more coffee at the speed I consume, as crew tend to be busier.) Overall I prefer either absolute front of the A359 A or K, or back of front cabin.

There is nothing else in the CX J fleet like the 77A mini-cabin in my view.

TLDR: (I learned this acronym recently) 77A minicabin is bw doors 1 and 2 and shares with First, which is its advantage. 35G/33K/33E/77K are all be doors 2 and 3 and share with the cabin behind not ahead. This is the biggest difference.