If anyone has compared these two directly then please share your impressions. I want an end game solid state amp and never think about the topic amplification again after I buy it. How would you describe the sound differences? Is the Niimbus better and if yes in what way and by how much...

First off, I want to point to this existing thread which started about 6 months back. The threat began as a sort of preview, and the OP has done a great job of keeping the first post updated as information became available. I'm posting this here so it doesn't get buried in the many existing...