Just yesterday I had a lot of fun trying out a new Collings MT.
I had never played a Collings before. This instrument sounded and played wonderfully.
Very fat sounding through out, low end growlers had a great tone and no "thunkyness". The high end was perhaps not as brilliant some mandolins, especially F style mandolins, but a beautiful tone nonetheless, not the slightest bit "brassy".
I would almost say it sounded creamy, in the sense that I could move between the high and low ranges without any of the small but distinct changes in timbre you can hear with a lot of mandolins.
When I switched to my Read Bear Tortis C style heavy pick, I fell in love with the mandolin all over again. The sound was to my ear an oval hole sound, though the MT has F holes.
Great playability as well. The neck fit my hand perfectly. Playing around I got the feeling that everything was within reach.
I just loved it. Collings MT is on my list.