The switch is a bit scratchy in stock form, much like Cherry and Gateron silent switches are. A light application of lube makes them feel smooth enough for my tastes, I would say comparable to a Cherry silent red.
These switches use an unusual silencing method. There is a rubbery “collar” on the stem which hits the switch top at top-out, silencing the upstroke. The downstroke, however, is silenced by a rubbery cushion inside the center post hole of the switch bottom housing. If you are familiar with the “trampoline mod”, it works like that, except the cushion is flat and doesn’t compress as easily, so the bottom-out doesn’t feel as squishy as the trampoline mod.
This silencing method works OK, but these switches are plagued by the same problem Gateron, Aliaz, and Zeal Zilent switches suffer from: Inconsistent silencing on the downstroke. Take the Cherry silent implementation for comparison: Cherry silent switches always feel cushioned at bottom-out, even if you hit them at different angles, hit them harder, etc. The other silent switches, this TTC included, are only silent most of the time, but if you hit the switch at an odd angle or hit it too hard, you hear the harsh plastic-on-plastic sound of the switch stem striking the switch housing, which is ideally supposed to be avoided with a silent switch.
Overall I would rate these as better than Gateron silent linears and worse than Cherry silent linears.