I have one and I use it all the time. If your seams are pressed flat and at and angle, it works better. I sit with it while it runs and now and then I guide the fabric out. It works for me.
If you search the board, you will see several positive reviews of this machine.
I use it and like it, but I don't think it is worth the $80 or $90 it sells for. If you can buy it on sale, I say go for it.