One of the best ones

I was looking for coupon plugin but all of them had some disadvantages. I found this one which probably does the best job. It requires a bit of time while everything is set up but the process is easy and quite clear. Everything looks good so far. One thing I would like to improve is the template of printable/downloadable file. Everything is a bit too small IMO and could have more customization options. Other than that, it looks good ??