30mg is enough to produce motivation and focus without too much stimulation. It can be dosed much later into the day than caffeine without causing insomnia. In fact caffeine seems to not affect me at all anymore and only produce negatives, yet pseudoephedrine seems very, very decent (much better than racetams imho). I would compare it to modafinil, but modafinil doesn't have any ergogenic potential for me (i like stimulants to help exercise sometimes).
The only problem is tolerance, in one week i'm up to 240+ mg of pseudoephedrine, which is cost prohibitive and (maybe) unhealthy.