I have had no freezing problems and I have a pretty low end system. The pack is pretty much perfect imo.
One thing that bugs me though is the sound for the M60s on the choppers. They are so quiet its almost impossible to hear them while flying. I think the M60s on the choppers should use the same sounds from the hand held m60s.
Another thing that kinda bugs me is there are a lot of units that are almost exactly the same. For example a lot of the "US Army" and "US AirCav" soldiers are almost exact duplicates. Im not positive but I think ive read that having a lot addons can hurt your performance, so it would be nice if addon makers could trim down their packs to what is really necessary, not to mention it adds a lot of clutter to the unit lists in the mission editor.
Another good example of this would be the UH-1D and UH-1H. The only difference as far as I can tell is that the UH-1H carries more soldiers. Doesnt that maked the 1D version pretty much useless?
After a week or two of playing around with the pack these are the only things Ive found wrong with it. Other than that this is by far the best addon out there in my opinion, even though I had no prior interest in Viet Nam addons. After playing with this pack I actually went out and bought We Were Soldiers lol. Keep up the good work