Inexpensive Winlink2000/Airmail HF SSB E-mail.
The only problem with using pactor 1 is that you''ll very quickly use up your allowable time. You''ll also probably have significant problems with dropped signals halfway through the lenghthy time it takes to download messages. If not extremely careful with who you give your address to, you''ll quickly find that you are swamped with messages to lenghthy to download in the available time and propagation conditions. This will lead to significant frustration.
Other than that, I guess pactor one is ok.
I only try to connect to anything other than pactor 3 PMBOs if I absolutely cannot connect to pactor 3 and HAVE to send something.