I have a 10K yumeya long handle, its only 5mm longer than the standard handle - a lot of money for not much benefit really.
I understand that the 18K version is 10mm longer than standard - that may help justify the price. You might want to compare to the new Jigging Master handle as well - I understand they are quite a bit longer!
I had to send my Yumeya handle back for replacement after the first outing, when the spindle which holds the handle knob came loose in the handle and was rotating with the knob - might have been an isolated incicent, but for all the heart ache, no where near worth all the effort for the extra 5mm.