I have seen the 3 hole and 7 hole caps run.  The 3 hole caps are too height sensitive and you can see color variation in the wheat on most years.  The 7 hole caps put out smaller amounts that the wind can break up and make it look more like a flood tip on a windy day.  I like the stream bars for performance the best, but after using the quintastream for 3 years I can't tell a difference in leaf burn and no color streaking.  The quintastream caps are much easier to use as you don't have to get out after every fence row pass to straighten the stream bar. 

In 15 years of running stream bars I only broke one and figured out a way to glue it with a PVC piece on the bottom for strength to make it work.  I did have to frequently get out and straighten the streamer and had to take 4-6 off the sprayer everytime I wanted to fold up.  What tends to break is the adapter or the triplet for the nozzles.  I broke lots of them over the years.  The adapters didn't cost much compared to the streamers, but the triplets aren't as cheap.  None of those problems with the quintastream and the cost was only 1/4 up front.  Just my perspective from using them.