You'll actually need an IR filter (Hoya R72 or similar) to get the "best" infrared look. Otherwise this film behaves like an ordinary b/w film. A red 29 will only go part way into IR with this film, but has it's own look.
Other bennies are that unlike true IR film, you can load and unload SFX in daylight and you don't have to change the focus of your lens like you do with true IR. Plus, newer cameras may have an IR counter that will fog IR film. With SFX, you can run it thru any 35mm regardless of what type of counter it has.
IR filters suck-up a lot of light and you'll need a tripod. I've found the best use for SFX is in scenics on bright, sunny days with a few clouds. Skies go dark and foliage goes white. It's also fun for female portraits.