It will improve handling but with only -30min added its more of a question of how noticable the improvement is and thus worth the money.
I'm not sure when I'll get around to installing these but my plan is to do a before/after and see what actual measurements I come up with. In terms of real world results I can't claim to be the best judge and I likely wont get out to the track again until aug/sept.
....I can always count on my friend placebo to provide the results I desire
added a picture to the OP