@rsf507- Yes I do have an update. I have completed the evaluation of Luxman M900u and Bricastii M25 amplifiers in the last week and decided to go ahead with the Bricasti unit. Although M900u was very close but here are the areas where I found Bricasti amplifier to be better, not significantly but good enough to move the needle, at least in my room.
1. Low noise floor. This was evident from the relatively quieter background.
2. Music appeared to be relatively faster and more enjoyable. This could be a perceived benefit of the lower noise floor.
3. Music appeared to be relatively punchier without being harsh. Its presence was effortless and it appeared that the amp had a ton of current to drive the speakers.
4. Enough details in both mid range and high frequency bands without being bass shy. The balance over the entire frequency range was very much noticeable in all of my critical listening sessions.
5. Exceptional control on the low frequency. The bass was exceptionally articulate, fast and non fatiguing. Tried all bass heavy songs from Pink Floyd, Holly Cole, Jennifer Warnes, Peter Gabriel to Random Access Memory and this amp delivered the bass effortlessly.
6. Last but not the least both my Dac and the amp being Bricasti products the integration was seamless. All of the above benefits, in my opinion, have originated from this happy marriage.
Luxman is also a wonderful product. It was a tad smoother and a little sweeter in the mid range than Bricasti. It lacked the power or the effortlessness, again not by a huge margin,, that I found in Bricasti. I also found the speed of the music to be a tad slower after hearing Bricasti.
I have to admit that the speed of music was a revelation for me in this evaluation process. Never heard it (music appearing faster) in any of my previous amp demo sessions. So when I was introduced to it in the beginning I thought it to be an artifact of the amplifier break-in process and a little odd but it was really not. It is a unique feature of the Bricasti amplifier that complements its all other characteristics. As I mentioned before it did sound a little odd in the beginning but I have started liking it and all other amps including the Luxman now sounds a tad slow.
Finally I haven't evaluated Luxman with its very popular pre-amplifier C900u which when mated with the amplifier M900u might yield a significantly better performance.
Thanks