I've got the PCS seat, and I liked the difference it made; I could only go around 45mins on the stock seat, and after the PCS remold I could break the 1:30 if I absolutely had to......but my wife could not live with the stock passenger seat; I was looking to buy a mustang passenger seat for her, and cam across a mustang driver/passenger with driver backrest on ebay for just a little over $350 (incredibly cheap if you have shopped around) so I jumped on it; it was used from a wrecked bike, but the only problem was the mounting bracket on the driver seat needing new screws...quick trip to the HD store (home depot....not the other HD that would charge $10 per screw

) and I was all set.
Haven't taken a long ride with the mustang, but I definitely think its a huge difference just sitting in my carport, and the wife is happy with it too. For what its worth, PCS says their reform pushes you a little forward compared to the stocker; I didn't notice this, but I definitely notice that with the mustang---in fact, I was at a riding skills practice day put on by the local police dept this weekend, and they were telling us to ride farther forward...I didn't feel completely comfortable in the position they were putting me with the PCS seat, but the mustang forces you nearly into the position they were recommending for optimal lean on higher speed turns and slow cone courses.
I'd find it hard to swallow the full retail on a mustang set, and I would have lived without it had I not found the deal I did, but I now see why some people consider this a priority purchase.