A prettier copy of a Harells it would seem.
Tim, not really...
In fact, all tuners, whatever what can be said, are a mechanic system that puts a moving weight, in and out, in front of the crown.
Being a mechanism that allows a moving weight, not much can be different... well...
The RS MK2 is really a tuner, and like car tyres, they look the same, but could perform differently.
What have we done differently?
Couple of things:
1. better collar fixing system
2. all screws the same wrench size
3. ability to lock (not rigid, because it allow a small movement - important!) the weight from turning
4. very close tolerances on the moving weight system (now you can move it whatever the clicks you want, and it won't be out of center - important!)
5. exterior and bore dimensions optimised (I won't say how long it took...)
6. prettier than Harells (true!)