Supercharger for a fe390
 

I have a '69 F250 Ranger with a fe390 from '71, electronic ignition, C6 automatic tranny. I was searching super chargers and came across this one:

http://www.torqstorm.com/kits_single_big-block-ford-FE.html

I'm wondering if anyone has used this brand and what their experience was with it. Did it produce noticeable results? Was it a relatively easy install? Is there another brand you would recommend over this one? Is it worth it? Thanks so much!!