From my limited experience, I’d say that if you’re tired of amp rolling, then A&E might not be for you... They’re very sensitive to different amps, as they’re electrically quite demanding and particular.
For instance, while Eikon sounds great out of my Mojo, and ok out of my Lyr, they only really came to life with my Valhalla 2 (the difference is not subtle). And it’s not as simple as just OTL tubes - the Atticus by contrast sounds “off” with the Valhalla, uneven and loose. But it sounds great with the Mojo!
So you might get lucky with the amp(s) you already have, but don’t be surprised if the synergy isn’t there and you need to go on an amp quest...
Dunc
It is true that the choice of amp is very important, especially with the Atticus, but now I've been reminded that the source is the most vital part of it all. Last week I posted that I no longer loved my Atticus paired with the Valhalla 2, and had found out that it sounded way better with my old X-Can V3. That is still true, but ONLY, in my case, with the source being an iPad 4 with iTunes playing AIFF files.
Last night, I went back to using Roon (whose subscription I wanted to cancel due to the high price) on my Mac, and suddenly, the Valhalla 2 became way better than the X-Can V3, which sounded too bright – and I haven't used Roon's DSP engine yet, which I'm going to take a closer look at today.
So I'm going to keep Roon, because, despite the high price, I haven't found anything that sounded better to me; I'm going to keep using the Valhalla 2, because it works better with the Atticus when Roon is the source (and I'm a Schiit fan); and finally, I'll make sure to never forget what Dirk Gently always says: "EVERYTHING is connected."
When the same headphone plugged into the same amp gives opposite results to different people, ask them which DAC and source they use. This might be where the difference in opinion lies – not to mention that we all hear things differently, a fact that will never get old.