These people will scam you. I purchased a voucher to get three oil changes there. It was a huge pain in the neck to use it. I would schedule an appointment, take my car in, then they would make up some excuse as to why that day didn't qualify. For example, Saturdays don't qualify according to what they tell you when you go it, but it doesn't say that on the voucher. After talking with the owner on the phone while I was in the store, I managed to get my oil changed. I was sure that this is the kind of place that doesn't actually change your oil or filter but they just tell you they did.
After much haggling each time, I managed to get two of three oil changes I was entitled to. They refused to do the third one and I figured I had had it, not worth arguing about with a bunch of crooks who probably aren't even changing the oil filter but saying that they are.
Do not go there. I called Midas head office to try to get this sorted out and they were just as bad.