I still love my older Levinson 336.
When I was deciding it came down to the 336 or a Pass 350.5. The Pass is a wonderful amp too - but I have wanted a big Levinson for a very long time and don't regret it one bit.
I prefered the 336 to the new 4xx amps that I listened to - which were all but the 436 and 433.
If you are considering Levinson - take some the older models for a test drive if you can.