I've used bio-spira to cycle several tanks because I'm impatient when it comes to cycling. What I will say is, the bacteria products absolutely work, but I'm not sure how much time they save over the long run. In my 38, I decided to add bacteria after about 3 days. The day after I had 0 ammonia and nitrite. However, I suspected I would have a diatom bloom and algae bloom, which I did. It took a couple of months for things to settle down in the tank. With that said, I'm not sure "quick cycling" my tank really saved time in the long run since you still have diatom/algae blooms that you'll have to wait out anyway.
What I like most about these products are that they're great for tank moves or an unexpected ammonia spike. I think they'd be great for a quick set up (like a frag swap) too, though properly seeded bio media would also work and is much cheaper.
Long story short, they work but I'm not sure they actually save you time if you're cycling a display tank.







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