Hi Julie! You’re very welcome for the info. In answer to your question, I think some are probably good, and some not so good. There are many people putting brainwave entrainment out there these days and it is not so easy to figure out which ones are and aren’t of reliable quality without investing time and doing some research. I would say (in general) that paid products are probably better quality than free ones, but I couldn’t guarantee this is a golden rule. My best advice is to just do your research before spending too much time listening to the freebies.
Much of what is currently written about brainwave entrainment, especially on the internet, is simply … incorrect.  It seems par for the course that when something of huge value is discovered as a potential ‘internet product’ that it is going to be marketed within an inch of it’s life. And often with less than stellar regard for actual science, research, or factual knowledge. 
With brain wave entrainment technology, changing brain wave states is an instantaneous and effortless process. The 'periodic stimulus' can be sound, vibrations and/or light. We have found that we get the best results with blinking lights which are experienced through closed eyelids. This is only problematic for people with existing diagnosis of photo-induced epilepsy, as blinking lights can induce a seizure in them. The programs are enhanced with Deepak Chopra doing the narration along with holographic sound effects and original music composed and performed by Rudy Tanzi.

So, I tried those frequencies. And after listening to the 1st one (High Beta to Gamma, Isochronic tones: 18HZ ramped up to 40HZ within 20 minutes) – I immediately stood up and started organizing! (Something that I kept forgetting to do!) Overall, I’ve found that isochronic tones & monaural beats are more immediately effective than binaural beats, though they are still good.
So my question is: Why? When I read it, I had a bit of a fear of brain aneurysms. Therefore, 1. could someone contact me to tell me why use of your product shouldn’t continue past 2 hours? [I probably won’t heed the reason unless it’s a life or death warning: I love this product that much!] 2. Please feel free to post my letter in your testimonials, if you ever decide to post such customer comments.
MindMachines.com specializes in providing theraputic tools for relaxation, enhanced learning, mind power, biofeedback, neurofeedback, high tech meditation and personal achievement. We have been in continuous operation since 1990, with satisfied customers in over 100 countries. We understand brainwave technology and know how to help you get the best results using light and sound therapy using our personal and professional light sound machines and brainwave entrainment technology instruments.  By combining competitive pricing and customer-friendly service Mind Machines will be your personal relaxation superstore. We only carry the finest selection of light and sound machines including: the Mindalive (D.A.V.I.D.) Delight, DAVID Delight Pro with CES and Alert Pro with CES light and sound instruments; the Proteus light and sound machine, Procyon brainwave synchronization, Thoughtstream biofeedback machine and neurofeedback training as well as dowloadable MP3’s, brain wave session files and beyond!

Brainwaves, or neural oscillations, share the fundamental constituents with acoustic and optical waves, including frequency, amplitude and periodicity. Consequently, Huygens' discovery precipitated inquiry[citation needed] into whether or not the synchronous electrical activity of cortical neural ensembles might not only alter in response to external acoustic or optical stimuli but also entrain or synchronize their frequency to that of a specific stimulus.[16][17][18][19]
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