I really like the Meitner because I listen to a lot of classical music and prefer a mid-Hall perspective. I don't like bright sound and don't need details front and center - though I want them to be there.
@paullb, that is a good way to describe the MA3. I loved how smooth and easy to listen to it was while offering very good resolution. Yes, it likely wasn't the most dynamic DAC I've owned.
The M3 I only kept for a short while and compared it more directly with an older SimAudio 380DSD, along with the RME ADI 2FS and Topping D90. I thought the M3 had very good dynamics (compared to SimAudio and RME) and likely equal to the D90 in resolution. It was not fatiguing like the D90 but was also leaner than the 380DSD. I replaced it with a more expensive MojoAudio R2R DAC that equaled its dynamics, gave up some resolution, but was more mid-hall, rounded, natural, organic, etc.. sounding.
The MA3 took the MojoAudio and M3 strengths and blended them together. I don't remember for sure, but I'm thinking the MA3 likely isn't as dynamic as the M3 or at least isn't more so. Resolution I would estimate is about the same.
The Weiss with the LPS likely has about the same dynamics as the MA3, but I actually think is cleaner and has more resolution. It is not fatiguing or forward like how I found the D90, it almost has a 'sweet' presentation. It is on the leaner side though more like the M3 or RME. My preference would be for the MA3 out of all of the DACs I've owned, but when you consider I have no need for the integrated volume control and streamer, the cost of the MA3 vs the ~$2K Weiss was just too great for me. If you don't mind a slightly leaner presentation the Weiss is very easy to listen to while giving you an amazing look into the recording. I actually find myself hearing more details in some of my favorite recording with the Weiss. There are other recordings where I slightly miss the extra fullness/mass of the MA3, but overall I'm very happy with the tiny Weiss.
Hope this helps...