Progressive Suspension

I own a 1998 HD Heritage with 25,000 miles.  The bike has a stock seat and is VERY comfortable for me, BUT da wife complains after 30 - 40 miles, sooner if running at highway speeds.  I was considering a Mustang Seat, however my mechanic noticed that the rear shocks almost buttom out with my wife and I on the bike (combined wieght 330 pounds.)  He suggested adjusting the shock, only to find there was no more adjustment left in the shocks.

So with that he suggest a set of Progressive Shocks.  Does anyone have any thoughts about this?  Has anyone had a simlular situation only to find new shocks helped?

Thank You - Harold  

I put Progressives on a different bike, but, my experience was "holy @#$%, why didn't the manufacturer put something like this on the bike in the 1st place". It gave my 800 almost the quality or ride that my wife's Mean Streak had.

They produce a quality product. The only caveat that I'm going to throw out is that they are designed for the same load handling as stock. Doesn't sound like you should be maxing out, but, had to mention it.  

UPDATE:
I've now had the Progressive Shocks on for a few weeks.  My wife has noticed a HUGE difference.  Our first trip with them was about a 4 - 5 hour drive that combined highways, state roads with traffic lights,and city streets. She went 1.5 hours before asking to pull over.  GREAT improvement from the 30 - 40 miles she might handle in the past.  Since that trip we went back to the mechanic for additional height adjustment.  So far she's much happier.  As for me, I was happy with the original shocks, but do feel that the bike seems much more steady.  Looking forward to my 7 hour ride I'm planning tomorrow.
Harold  

Wait until you get around to doing the fronts. It'll be taking the ride to a whole new level once again.
Unlike the stock unit, which is a linear spring, there's are truly progressive. For example, it may take 50 lb to compress the spring 1 in, it takes an additional 75 lb to compress it another inch, and maybe another 100 to compress it a third inch. The springs get stiffer as the bumps get bigger. It also allows them to be a little softer on the small stuff, protecting your shoulders.  

I used to get the same response whenever I put new springs on my harley shocks. You do know you can just buy the springs, don't you? The springs on my shovelheads used to last about 20,000 to 25,000 miles. It sounds like they haven't improved them.

If you find someone who guarantees their springs for longer than 25,000 miles, it might be worth it to replace the whole shock assemblies.

regards,
Joe