|Boingo Diaper Fastner (photo from Chickapea Baby)|
The Boingo is two little gripper pieces on a tight rubber band type thing with awesome stars on each end. You attach one side to each side of the diaper and you're done. It really was pretty simple and now I don't know why I always thought they were so daunting.
I was worried about using it as I had heard that the Snappis aggravated reflux in some babies, but I didn't notice any problems with the Boingo. (I've never tried the Snappi so I can't compare the two from personal experience.)
I got mine from Chickapea Baby for $5 per pair. (Link to purchase) It worked really well and was really cute. If you're going to be using any type of diaper without built-in fasteners, this would be my recommendation.