I have a Hana SL with approx' 200hrs on it, the Cart' with a 100 hours on it, shared the latter 100 hours on a SME IV and Audiomods Series Five Micrometer.
I have not experienced the Cart' in use on the TA that has superseded the above TA's.
I do believe it has broken in at the time of use, I do not see the need for further hours of usage to achieve a break in.
It is one of the only Cart's I own, that can has failed to present itself as appealing to me through use, it plays music fine and for me that is the win.
It is idling away in storage, maybe I should have sold it on.