I love those rockets. I've built several. I had one that probably made 20+ launches before the dampness of an early morning flight finally did it in. I built a few for a scout launch that was confined to a small tree-lined site to avoild losing more expensive rockets. One thing that is real nice about them is they give a very high performance flight on an A motor. B motor puts them almost out of site.

Oh, the fins.....I didn't find they were a problem at all. One trick is to score the lines before you fold. I typically use one of those very small screwdrivers, the kind used for working on small electronics, etc.