All in all this was Ok, but not the best building toy. I remember the tines breaking fairly easily and parts for of wearing out fairly quickly. Legos, Lincoln Logs and Erector are at a distinct longevity advantage.
There was actually a building toy I had that I can't seem to find any info on that sparked this post. It was toy where you used little pipes and connectors to build things. It looked very similar to PlaySkools giant Pipeworks Toy. Only on a small scale. It also had more base parts that the pipes connected to that were terrible to step on. You think Lego are bad these would actually impale you. I remember the set was somehow related to marvel super heros, having these terrible spider man and hulk figures and it had instructions to build a plane.
Summing up the Bristle Blocks, they are good for young kids and easy to work with. But pretty limited compared to better building sets that are out there.