1. Is either one or the other more comfortable?

I have the 2 piece with 13" Passenger Seat. (over the top of the rider seat) I ride Solo about 50% of the time so I remove the passager seat and use the Mustang Rider Backrest. Much easier to ajust both up and down as well as forward and back. To me its supports my back much better then the HD back rest.

2. Any more room for a 6'2" guy with one vs the other?

It will sit you slightly lower in the saddle, I think it moved me slightly forward as there is more back support (thicker), but not enough to make a big diffrence in my leg position

3. Looking to get a driver's backrest - does everyone go with the Mustang or the MoCo backrests? Any issues using the MoCo backrest with the Mustang one piece?

No issue if your using a 1 piece mustang seat. I,m not sure about the 2 piece

4. Does the Mustang seats really make you seem to be sitting on the gas tank?

I dont feel it has moved me that much forward to feel as if I,m sitting agains the gas tank

 

 

To me, the 1 piece was more "cushy" (It has an additional inch of padding) but I prefered the narrower nose of the 2 piece. The one peice gave me a pressure point under my left thigh, that while not really bad, was less comfortable after a few hours. The extra width of the 1 peice did not seem to contribute any extra comfort, for me at least. (Im 6 feet tall and 215 lbs)

The two piece will sit you a bit down and a bit back, so I would say its more roomy based on that. It will however, be more crowded for your passenger as a result.

Get the Mustang. The Moco backrests are crap, as far as Im concerned. Ive had both types, and neither could ever be positioned even remotly close to far back enough for my taste. As well as being so thick (espesially the adjustable) that it takes 2 inches of room away from your passenger. If you go with the Mustang 2 piece, you can get an optional angled bracket ($15) which allows it to be positioned even further back. I run mine almost all the way forward, and its just right for me. (compared to the HD bakrests that I could never get far enough back to be usefull) And the backrest makes a HUGE difference in MY comfort.

In my experience, no more so than the stock seat on an Ultra. The one peice is about a match for the stock seat, the two peice moves you back.

 

Same here.
No issues and wifey is comfy as well. Also allows you to go for the solo look which is nice flexibility to have.

 

Here is the ONE piece Ultra Touring on my scoot


HERE is the TWO piece solo with pillion: The Pillions are the same size as the two piece rear seat. Notice how the solo rides much lower and a little narrower than the Regal. It is a better ride and a more controlled riding position for me.


HERE is the Ultimate solo seat I reserve for special occasions C&C Customs seat. It is very comfy. less padded than Mustangs but built very well and sits me lower.

 

Ditto, same here.

My Mustang also feels like it moved me further back, not up on the tank. Can stretch my legs out better with the Mustang than I could with the stocker.

 

like the mustang went with c&c.

 

I just can't get over how ugly those sport touring seats are on a FLHX. Those pinnions are HUGE!

 

Here's why I have the 2 piece seat. It's great for how my bike is set up................

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Two piece here and best seats I've had yet. Tried many over the years on several bikes.