Hey Yall I think I might be able to provide some 1st hand input. I supercharged my truck 10k Miles ago. Eaton style twin screw, Magnuson 5PSI supercharger, with intercooler. Ill attach photos. I haven't had a single transmission issues as these trans are able to handle 500hp, however, I don't race it or beat on it.
Too bad your not closer I would let you take it for a drive, there is def. a difference in TQ, which can be felt in Seat of pants. I went twin screw over centrifugal, because of its low end power and that's what I was looking for. I missed the Torq of my 5.9 Diesel, and I still do. with that being said, If I had to do it all over again, I wouldn't supercharger it. Now I have to run premium, and I get worse gas millage (-3 mpg over stock) and that's when I dive it like a saint. I rarely see 17 mpg any more unless I am down hill in neutral lol.
On the positive side, its quick, you will never have a problem passing or getting into traffic if you can keep the tires planted.
The install process was fairly easy, I replaced all my plugs while I was in there and that took about as long as installing the supercharger. Magnuson does offer a military discount, but I was less than satisfied with their tech Dept. You can only email them and wait for a response. I get a P113E code now and then and they cant seem to figure it out, nor can I.
-update, I cant figure out how to post photos...