I also have the low end NG, and while it's manual, meaning there is a ceiling on how many I want to clean at a time, it's effective. I am like Sberger - the money is better spent elsewhere. But getting a machine that cleans is well worth some dollars. I don't know from personal experience, but I suspect the incremental dollars don't increase the effectiveness - just the effort, sound, etc. If others have had several machines, I'd be curious to know if pricier machines do a better cleaning job, or if they mainly impact the process.