I would definitely invest in PACTOR III (P3). It is much faster and performs better in questionable conditions.
I have an older SPS modem
with a serial
port that I now run into a serial/USB dongle and run P3. I used the system as a part of a communications
system while working with International Health
Services in the back country of Honduras
for several years. We were always passing traffic here and there. I found that when I could connect to a P3 PMBO everything was great. It would speed up / slow down as conditions changed. When I could only connect to a P2 PMBO things were not so good.
Things typically took 4-5 times longer than with P3. Transferring small images
, weather maps, ...) that I could get in about 5 minutes with P3 would take 45 minutes with P2. Many times I'd just give up and go searching for a P3 PMBO that I could connect with.
So spend the extra money
for P3. Don't go with anything less.