I have owned or listened to the 27, 27.5, 29 (recently sold to a happy buyer) 331, 331.5, and 336. I know what people mean by sterile, cold, or analytical but it depends on your other components including cabling. I find ML amps neutral meaning what you feed them is what they will play back. They can be non-forgiving with the wrong speaker but you will not find a better built amp. I love them especially the look of the 300 series. IMO they are a work of art and put a smile on your face just looking at them while listening. Levinson has been around a long time and look at the resale on the used market. Some amps have gone up in value especially the older .5 series. When I sold my 27.5 two years ago it sold within an hour. Impressive, and they still are snatched up quickly if the price is right and not blown out of proportion like some idiots think they can sell them for. I say buy one and don't look back.
Sam
Sam