It is more compact (both physically and sonically). It seems to have a more focused, direct sound. It's not as bright as the 184 bell, and doesn't get nearly as edgy when pushed. It can still get there, but not as easily or quickly as the 184 bell did.
My horn played on the flat side before, so the tuning slide was all the way in. Now I can have it out a bit (this bell is about 1 1/2" shorter than the original bell) and have room to adjust if necessary.
Of course, Dan did a great job on construction (my soldering was a bit messy getting it together, but I'm getting better!) and I couldn't be more pleased with the trade. Now for some Frankenhorn dorn!

He managed to save some of the engravings off both bells (kinda hard to see):

