Over a year ago I bought a cheap vortex mixer for my paints. I reviewed the product at the time but it wasn't clear if it would either be used much or keep going. Fifteen months later it is still going strong and performing the job I bought it for.
IMHO a bargain, but maybe I have just been lucky with this low-cost alternative. As usual, I would love to hear your experiences with vortex mixers - cheap or expensive - in the comments below.