The late John Darling shot a Rapid. Also a tuned HW80. The Rapid was better.

Yes, they have a cult following. They were one of the first PCP's to sell in numbers and just worked. Many cut their teeth on them. I suspect they will hold their value if not increase. For collectors then unmolested and mint in box will make a premium. These will become extremely rare as few will survive the using and tinkering. The second group to hold future value will be well sorted and fine tuned examples, but they need to be done well.

Like the HW35E, HW77, HW80, Original 45, Webley Omega, and FWB Sport, the Rapid will be a future proof classic great. One of the first PCP's that got a following and holds respect. Grab them while you can. Best bit they still hold their own with the modern offerings.

I don't even own a PCP. If I did it would probably be a Rapid.