I have ridden in the transition sleeper on the Texas Eagle many times. The roomettes are exactly the same as is a regular sleeping car. Yes, you can hear the whislte more, but I don't mind that. Engine/track noise - about the same as anywhere else on the train.
A Sleeping Car Attendant will greet you, and will make up your beds for you. I don't recall there being a coffee pot, but since I don't drink it, that was not a problem. Coffee is available in the regular sleeper, which is just one car away. I found the showers to be larger and nicer than the one in the regular sleeper. It's true, you don't see your attendant much, but, really, what do you need him for?
If it's available for a lower price, by all means, take it!