I've just gotten the app up on my site and seems to work relatively well, though no one has placed a reorder yet. It can be a touch slow in loading, but nothing drastic. Support is extremely fast. The reason they got 4/5 stars is because, on a couple of occasions, if I asked for 3 things from support, one was missed, probably due to their speed.

Overall, it seems simple and should work well for us.

UPDATE (Reply to Developer): It's all good - it happened more than once, but I have a feeling it was just because they were moving so fast trying to get things taken care of that things were overlooked. No worries.