I bit the bullet and ordered a bottle of the stuff when an RI spread through a big chunk of my collection - I'd say it's definitely worth it. A tiny bottle goes an incredibly long way since it's so concentrated. I dilute it in a little spray bottle and use it to wipe out my rat tanks as well as my bp's enclosures. Works great, gets rid of smells.
Don't know if you know already, but Brian from BHB has a video where he describes how to use it to nebulize a snake with an RI - you dilute it down and put it in a fogger, and it's safe for the snake to breathe and cures the RI. It's antiviral and antifungal, on top of antibacterial. Cured it right up! Only cost me about $80 for everything, would have been hundreds for a vet visit. The video's called 'my snakes down with the sickness' (or something along those lines) if you're interested.
Worth it. Bottom line.