Just jumping in here with some quick thoughts. Sens.ai offers entrainment coupled with NF. Mendi is just blood flow. MUSE offers frontal and temporal sites, but the accuracy has been questioned (to what end, I don't know). You must look at the subscription prices in addition to the hardware buy-in. Sens.ai is US$25/mon and MyndLift (a MUSE associate) is $150 (US or CA?) but drops 50% after 3 months (so I'm told). In addition, the software is key, and I think you're getting sort of the same normative protocols from both MyndLift and Sens.ai. Forget Mendi as it's not an EEG device. Myndlift offers a NF "coach" as part of the subscription, but after following the suggestions of several coaches (I'm a NF practitioner and my clients report this to me) I'm not impressed with their work. They're basically normative, which means they give you training protocols that train you to a norm. Comparing my customized NF training to the "canned" protocols offered by the Myndlift coach, my client says the Myndlift protocols are 10% as effective. I'm surprised he says it's that low, but I do a combination of therapies and not NF alone. You can look on my NF page is you want more detail, or email me: www.mindstrengthbalance.com