I have a lot of notions that I haven't used yet but they were on sale or given to me.
I have a little square, flip up seam ripper that I love because it doesn't roll. I had a red and white one that was just almost worn out. Due to a "postage mix up" one of the ladies I mailed some fabric to in Canada sent me a "goodie post". In it (among a bunch of other things that I loved) was a brand new yellow and white seam ripper--the square kind just like the one I'd worn out!!! YEA!!
My Ginghers are something I love, along with my rotary cutters, rulers, mats, Oh my spinning mat, love it!
As far as ones I don't like, I don't have too many, some refillable marking pens that pull the fabric, some chalk markers that don't wash out well. That's about it.
I have a Sidewinder that I love but I don't use the batteries, I plug mine in. The batteries just don't have enough pull.
Also if yours isn't winding tightly enough, wrap the thread around the knob 2x and don't use batteries, plug it into the wall.