Optionify:More Product Options

Poor Customer service. Denied their bugs even though it was their code and marked as Solver Circle's code.
Also published an old theme created almost a year back without thinking and changed the front end of the store to an almost blank template so my year's worth of work was lost on the front end.
Do not recommend them at all unless you're happy with a buggy app as well as them changing things on the front end to affect your live store!