Personal Experience: Harrelson
Cons:
Expensive $$$$
Heavy, VERY Heavy
#7 bell Splits Soulo Hat Mute (But it still maintains it's muted sound)
Pros:
The most easiest blowing horn I have ever experienced AND highly accurate at slotting with #4 leadpipe; #7 bell
The SWE technology that uses caste bell and tuning slide turns Harrelson manufactures on his own machine tools results in uniform brass thickness at the bends (traditional bends results in a thicker inner turn; thinner outer turn). Maintaining this uniform thickness minimizes energy loss of the projected sound wave as it transfers down the horn.
With #4 leadpipe; #7 bell has highly controllable sound range that can provide almost a flugelhorn tone with soft attacks, on the darker side with routine play, but can open up with projected accuracy that cuts through ANYTHING when focusing more air through the horn.
Comes with cool finger button options
AND you can have optional art added to the horn. I chose a tuning slide symbol that puts my two professions together; the bop musician's sixteenth note; serving as the serpent's staff that symbolizes the medical profession: