Fair play. I have mine only 2 weeks, and have only managed 650K so far, work and foul weather got in the way. Love the brute. Fixed fairing is super, handling is light, goes great, stops everyone that sees it....perfection on wheels and I agree with you on the seat. I have had two Road Zeppelin seats on the last two Electra Glides, one a 2007 and the other a 2010 FLHTK. They were absolutely fantastic seats for long runs,the older version being much better than the later model.
This bike, I think I'll hang on to the stock seat as it is, so far, very comfy and my lovely wife adores her heated backside. Perhaps next summer on my solo trip to Europe I might swap over for the Road Zep again as I find the stock seat about an inch too low...but I'll put the stock seat back on again afterwards. (Keeps momma happy.)
We're looking at the Road Zeppelin -- on a Street Glide. The specs say it is compatible w/ the grab rails and standard backrests (I have both.) It's 20" wide. The stock SG seat is 16" wide. Seems like that 4" would help support hips on the long runs. I'm looking at an Iron Butt 1000 mi. / 24 hr. run in the spring. But more than that, I tend to ride in the realm of 500 mile days a lot.
I have no issues w/ the $729.95 price. I just put $500 into the LED headlight, and it was worth every cent. The Windsplitter 10" windshield solves a lot of problems too: I can hear the radio and my head doesn't buffet like it's in a washing machine at 70 mph.
And so . . . let's talk about this new Road Zeppelin seat?