I was reluctant to book any capsule type hotels since I am sensitive to noise, but Gardens Cabin was great when I stayed since no-one made any loud noise (snoring, etc.) With the room layout, however, it only takes one person snoring to wake up the whole area.
Deluxe Cabins are practically hotel rooms, with decent space for soli travelers. It is significantly better than the standard types that are indeed capsule-like.
The 'doors' are plastic slides that fully close In terms of privacy, the doors have a slight opening at the top, and therefore noise do come through that opening. The doors are however seal completely and therefore no-one can see the inside once closed.
The shared toilet area was extremely clean, and was kept so with the manner of the local Japanese guests.
Earplugs, headphones, dental kit, comb, and pajamas are available, and overall the experience was great.