My eyes were crossing with the near identical machines littered all over Amazon. It's also difficult to tell the difference between a $50 machine a $120 machine when they look near the same and have a wacky company name that seems only made to brand that machine. Without buying and testing them all, they all have the same features and sadly seem like they're just mass produced knock-offs of knock-offs. Quality? You probably won't find out until a few years later if you're lucky.I was really pleased with the Rockville purchase. Immediately, I could tell this was a more solidly built machine with thoughtful, well-written instructions. I was even taken aback with how many features this machine has and the ability to control.What I really like, and what I think is a MUST for fog machines, is the timer system. I actually have another machine with this control and it was the feature I wanted the most. Unfortunately, my other machine's pump died and while I did manage to repair it, I wasn't sure I would succeed in time for Halloween. The Rockville machine's controls allow for interval and duration like my other machine, and also intensity! The ability to set and forget these controls allows you to dictate exactly how much fog you're pumping out based on the occasion and not have to manually activate. I like to set my machine up well in advance of Halloween on the evenings - with my blacklight spots turning the foggy air purple, it's a cool effect. With the timing/duration/intensity controls, I can make sure I don't run out of fog juice before the main event.If you've bought any cheap atmospheric LED lights before, you typically get a generic remote and have to just figure out how to control the lights. While I actually didn't buy this machine for the lighting, the precision by which you can mix colors and intensities was a pleasant surprise - and it has an LED display. On top of that, if you have XLR cable driven sound, you can run the plug through the machine to get light pulsating to your beat. Maaaybe I'll use that sometime. Even if I don't, it's just another sign this machine is a step above other choices on here. It's intended as a starter effects machine for DJs, which tells me it's designed for a more demanding client than the masses of machines designed for once-a-year holiday stuff.Very happy with this purchase. It's a bargain.