I've been using the Thermacell E,Series E65 for a while now, and it's honestly one of the best purchases I've made for spending time outside. I used to get eaten alive by mosquitoes every time I sat on my deck, grilled, or went camping. Now I just turn this on, wait about 15 minutes, and the difference is amazing. I still might see an occasional mosquito flying around, but they don't bother me or try to bite. It really does create a nice little protection zone. Setup couldn't be much easier. I charged it with the included USB cable, popped in the repellent cartridge, and it was ready to go. The battery lasts a long time, and I haven't had any issues taking it from the backyard to the campsite or even to a picnic. It's lightweight and easy to toss into a backpack without taking up much room. One of my favorite things is not having to spray bug repellent all over myself. No greasy skin, no overpowering smell, and no worrying about getting bug spray on my clothes. It's just a much better experiance overall, especially when you're outside for hours. I also bought the refill pack with the 3 cartridges, and they last a long time. I like not having to constantly order replacements, and it's nice knowing I have extras ready to go. The only downside is the price. The refills work fantastic, but they're definitely expensive for what they are. I wish Thermacell would lower the cost a bit because you'll eventually need to replace them if you use the device often. Still, I'd rather pay for refills than deal with mosquito bites every weekend. Overall, I'm really happy with this purchase. It's easy to use, portable, and it actually does what it promises. Even with the pricey refills, I'd buy it agian because it makes being outdoors so much more enjoyable.
