IBA needs a new award- BMW Riders Platinum- for any BMW owner who can do even the basic 1K run on a stock RT seat. My first $300 Yamaha was more comfortable and that was the cost for the whole bike....
Don't own a Russell and can't say I like sitting on leather in hot humid weather but they are available otherwise and well proven by many. I prefer the carefree simplicity of vinyl and use a Sargent with a BeadRider.
Asking for opinions on seats isn't going to be much help- only the owner is going to be able to say with absolute certainty what meets his needs and there are fans of all the major makers of custom or aftermarket seats..