Having flown in Business Class on a Singapore Airlines 777, Delta 767, Delta A330, and an Air New Zealand 777, the comfort of these "lie-flat seats" reputation promises more than they deliver in my experience. Lying flat, my movement constricted by a seat belt, I was uncomfortable and got little sleep. On my most recent experience, the Delta A330, I put my seat into my often-used at home Lazy Boy fashion, I actually went to sleep and got some good rest even with my seat belt fastened.
Providing such airline type Business Class seating on Amtrak to replace Sleeping Car Roomettes is an idea that ought to find its way to the dust bin.
Incidentally, Air New Zealand provided my absolute best Business Class flight experience from their LAX Lounge to luggage retrieval in Auckland. Delta has been #2 (from which Amtrak's new CEO has come). Singapore was a disappointment, particularly for what it cost. A Flight Attendant whose English was only slightly better than my whatever she spoke. Helpful with a mal-functioning entertainment system: "I'll be back to help." We had a crew change and the system was re-set before it then worked. A "Book the Cook" dinner that disappointed (overcooked steak). A light Supper after leaving Hong Kong and the breakfast before landing in San Francisco only met the culinary expectations that I expected.