We just booked this at the very last moment as it was sailing from Cape Town to Southampton and were delighted there was space.
This was our first Cunard experience, but I think virtually all other passengers were long-time fans of Cunard.
I really cannot find anything to complain about. Check-in was professional and we received our suitcases relatively quickly. The cabin was a decent size, as was the wardrobe and small balcony but perfect for two.