Had a Hartco on a 2004 Gold Wing. Now have the RDL on my B. No comparison, IMO. The RDL starts by looking like it fits your butt, which it does in my case. The "Day Long" part is no joke, and it's there for a reason. Not inexpensive, but neither is a good helmet for your brain. Would not think of getting something else.
Mark at hartco is awesome, he keeps you informed with the build of the seat. Im super happy with mine ive had it for almost 2 yrs. 300 mile ride is nothing now.