Tomyran, increasing resolution in speaker designs is, for me, a welcome evolution. But as you point out, it is a two-edged, if not multi-edged, dilemna because increasing the resolution of the speaker puts huge pressure on all the rest of the system feeding that speaker. Higher resolution designs will expose any problems further back in the reproducing chain, thus challenging all of us who chose higher resolution speakers to be very careful about how we assemble the rest of our systems to obtain the value of that higher resolution.
While some speaker designs seeking higher resolution do so at the expense of musicality, I think every owner of Merlin speakers will assure you that Bobby Palkovic has created a line of speakers that are incredibly resolving but highly musical. The VSM-MM/MX speakers (that I'm most familiar with) will allow you to hear everything going on in the recording, follow every musical line, accurately reproduce the subtle difference in the timbre of instruments, accurately recreate the tonal beauty of well engineered recordinga and throw an incredible soundstage in both width and depth - PROVIDED the rest of your system is similarly up to that challenge.
The Merlins will NOT introduce articifial definition / resolution, but they will very accurately and very truthfully tell you exactly what is going on elsewhere in your system and (more importantly) in the music and on the recording. If you hear hard, etched or edgy sound with Merlins, look elsewhere in your system or the source material for the cause: it will not be the Merlins.
I am not an owner of Merlin speakers, but I'm a fan in their price range. The Merlin VSM-MX is an incredible speaker, particularly when matched with excellent tube electronics, such as Atma-Sphere, Joule, Berning, Viva...
Bobby will be the best person to talk with about the particular match of your amp and his speakers.
And I realize I've not answered your specific question about the sonic differences between the different Merlin speaker models, TSM vs. VSM and MM/MX. As Thedautch suggests, Bobby will give you the best and most accurate summary description of those differences, but hopefully others will chime in to help answer these questions.