Long review incoming - hope it's helpful!I'll start off by saying that I've just received the Aculief tool and therefore haven't had much time with it yet. I'll update my review if any of my opinions change!My Story:I have suffered from chronic migraines for my entire life (I'm 25), and it has been a constant struggle to find things that work for them. I've cycled through almost all the available medications, and with health insurance in America being what it is, I never have enough of the medical relief that I need. Therefore, it's very important to have tools at my disposal that can tide me over when I don't have my medication!I'm a bit skeptical about acupressure, but with how severe my migraines are I'll try pretty much anything once. I've heard a lot about how powerful the LI4 point is, and when I read the other reviews for this little gadget I thought it couldn't hurt to try it.First Use:I've been experiencing a severe migraine for the past few days due to heat and pressure, and I've decided to break this tool out at work to see if it can help me get through my day. So far it's actually been surprisingly helpful! Keep in mind that I am also using medication, so I can't speak to its effectiveness as a solo migraine treatment, but what I can say is that I notice a definite positive change in the level of pain in my neck, shoulders, and head when I am actively using my Aculief.The Basics:The Aculief tool is very small and easy to slip into a purse or other bag (I keep it in an inside pocket of my purse or a pocket in my jeans when I'm not using it). It's relatively discrete, save for the color, so it feels appropriate to wear in an office environment. It stays on while I work (I'm wearing it as I type this review), and so far I haven't experienced any slippage. One thing I have noticed is that in order to hit the LI4 I have to wear the tool differently than is shown in the product photo. I have very small hands, so it's probably just that the tool is designed with the average hand size in mind. It's not a huge issue, in my opinion. You can see in the photos I've attached how I wear it.One other thing worth mentioning is that, because the tool squeezes your trigger point, you will have some noticeable redness on your skin after taking it off (see attached photos). This seems pretty normal to me, and the redness does disappear after a little while. I imagine that if you use the tool too much or have it too tight some bruising could occur, but I can't say for sure. I'm not a medical professional, just someone with a lot of chronic pain and experience. :)With regards to worries about stretching the tool: I have been playing around with the flexibility and have stretched it very far with not even a hint that it might break. It seems very well engineered!Why 4 Stars?I only gave the Aculief tool 4 stars because it seems a tad overpriced to me. I get the feeling that you are paying for the branding and aesthetics along with the engineering. For what it is, $20 seems a little much. However, if you are in dire need of migraine relief, it is worth a try if you can afford it.Another consideration in my review was the discomfort I experience while using it - this isn't the fault of the tool itself; it's just the nature of this type of pain treatment. While I do wish it fit my hand a bit better, I understand that I am probably not in the majority when it comes to hand size.OVERALL:A very handy little tool for us daily migraine sufferers! I have noticed relief when used in conjunction with OTC medications like Excedrin. Easy to use while working, no effect on ability to type, etc. Will leave some redness after use. Slightly overpriced in my opinion, but still worth a shot if you are in need of quick pain relief.