Nothing beats having an extra filter running on a tank and transferring to your new tank, but if that is not at your disposal than this is what you want to use. Will stay in the fridge stored for up to a year, 6 months if opened.
I used it when setting up a 29 gallon a few years back and it worked great. Threw some fish in right off the bat without cycling and they were fine. That was 4 years ago and I would use it again to speed up cycling if I needed to.