We use disposable ones
-- not sure if you are talking about those or if there is a non-disposable kind available.
My feedback is as follows:
1) It makes a loud hiss that often scares the patients. Especially the babies, the neuro kids, and those who are nervous about an IV stick (so that's almost everyone). Even if you warn them and make it sound fun. We say it's a "rocket ship."
2) It doesn't work all that well. Some RN's swear by them and that's great. But when I have seen or used them, the kids still flinch with the poke and try to pull away. Those that are able still say "owie."
3) It can make veins disappear. Especially on the hard sticks. The trick is to do it next to the vein, not on the vein. But even then sometimes a vein will disappear or be hard to thread after the J-tip is used. And yes it's okay to use with AC veins. Pretty much anywhere but the head/face area.
4) It can spray people if not pressed down firmly during the application process. Easy to do if a kid pulls away quickly or they are chunky and it rolls on the skin.
But like I said a lot of people really love them. And maybe there is a better way to use them that I don't know about.