I used to use the one on my Janome. I found out the needle had to be all the way up for it to work. I bent it, so I removed it. I have tried the one on my new Brother but it seems a bother (lol, that was a rhyme!)
In any case, a tip I love is that all needles have a groove above the eye. You do not need to be able to see well to insert the thread. Just push it against the needle slightly above the eye, it slides right in. Works great for me!