Might be effective in practicing. As in, reading from a book at home, you'll need to be hyper-focused on what you're saying and where you are in your sentence. Not sure it'd be good in conversation. Couldn't you just try the Speech Jammer app out, and not have to drop a ton of money on a device? Obviously they're not gonna be the exact same thing, but just to try it out. Might work for you, might not.