I have also purchased the PDK and do like it, just keep in mind what you want out of the package...
I wanted the ability to create an .exe and also the gui debugger.
They are not focusing on the debugger as there is a version in Komodo (which is also a nice product). So that is a bummer...
And you can use PAR to do the same thing as PerlApp. I am sure each have advantages, but I haven't used them enough to notice.
I will also say their support was good, it took a little bit of time for the listserv, but they were always knowledgeable and responsive.
If you have the time, the best is to use all of them and then choose ;-)
And finally, TextPad is a good editor, much better than notepad!!!