As Chuck has stated, Russel will work with you and guarantee results! I am on my 5th Russell. Why? because I know I will get quality and comfort and adjustments under warranty if they are needed, to this date none has needed any adjustment. Have I tried others? Yes; A riches from Washington state is not bad A BMS built by Rocky Mayer was OK on my 2000 Kawasaki Concours, A don Webber from Albany Oregon on my HD ultra improved it from a one tank per day to a 3 tank per day , BUT NOT ALL DAY COMFORT. A RUSSELL IS ALL DAY COMFORT like 1500 mile in under 24 hours.comfort with no sore, aching butt!
The price difference is not signifigantly different from one to another. you can get a non fit to you Sargent if you so choose, but in my humble opinion you are spending almost the price of the Russell for something that may be a improvement, but after a day of long miles you will most likely ask yourself why you didn't get the best available rather than generic take a chance on it potluck.
I personally don't like spending money and being dissatisfied and then being stuck with something that is very hard to resell etc, but as I have already said the choice is yours.
Eldon