I do not have a TON of experience with eyelash vipers, seeing as I only have 1. But I've had her for about 2 years, so I DO know a thing or 2. As already stated they have a SERIOUS striking distance. I find that mine is hesitant to strike at me unless my glove or hook actually touches it. This was especially true when she was very little but I used it to my advantage. When feeding, all that i needed to do was touch her with the food item and she would strike and hold it, eventually swallowing it. They are almost exclusively nocturnal, I do not recommend cage maintenance during the night. Most times they are very calm and relaxed during hooking or anything else for that matter. But at night they can really FLY up a hook.
They seem to be very hardy, I keep mine in a cage with a hot spot of 90 and a cold side of 70. She tends to hang out on the warmer side just out of the hot spot, probably mid to high 80s. I do not mist her down very frequently, every 3 days or so. All in all, I am very happy with mine, and I hope you enjoy yours.