Sawyer extractor is great for immediate use in the event of a bite or sting-one significant draw back is damage to local tissue due to vaccume action-it can cause the toxin to pool in the tissue and cause some local necrosis-its still better than nothing but its one of those things you need to be aware of before using it. The best use for this device is as soon as your "hit" apply it lightning quick and leave it on for a min of 5-10 min. , then release it...........its design is to try to get any residual poison out of the tissue before its effects fully set it.......in most cases the toxins are gone about as fast as the bite/or sting happens due to blood flow in the surrounding areas. But compared to the old cut and suck method........its better than nothing. Lastly if you do get a bite/sting, stay calm and do your best to reach medical attention.