I loved Copy Paste under OS 9, and purchased a few other titles from Script Software a couple of years ago. I think I've had problems and disappointments with all of the titles and/or I just don't use them anymore. There are many Shareware/Freeware pasteboard alternatives for OS X. I also used PTH, but when I tried to pay it was already part of You Control, so my money went to Butler. Butler has a few bugs when creating custom pasteboards, but customer support is great and I'm glad my money went there. Still, there are many free alternatives.
By the way, I did want to purchase Copy Paste for OS X, but it was too buggy at first, and there was no upgrade price. Now it's more expensive, and still no upgrade price for "old" OS 9 users. I often purchase software where the donation is voluntary, so price was not a concern, but it is always "nice" to get an upgrade price after supporting a company's products over the years.