This may fall into a comparison of the 2 other players in this realm.
Sounds are OK. Nothing remarkable compared to MTH and Legacy sounds. No enhanced crew chatter. Only 1 engineer and one dispatch announcement. Engine sound OK. Horn loud.
Lash up worked well. I like that the engines have all functions and can be independently operated. Good if you use only 1 A unit and you want to rotate to the other A unit.
Detail is very good. The trucks stand out compared to the other 2 players. Fixed pilot conversion included is nice for those who choose to convert.
On balance, I'm OK (barely) with the purchase. $450+ per unit gets you into numbers that are inline with the best of the other 2 players offerings. I do take some pleasure into putting money into Atlas as they are a good company and do help keep the others on their toes.
Just my thoughts here. I had to get locomotive power for my new MTH California Zephyr set. The E-8's were gone. The Atlas engines are nice, but lacked a "wow" factor.