I have been using wood guides in my Delta/Rockwell 14" saw for at least 15 years. Started right after ruining a new blade with the original steel blocks. Cool blocks had come out recently, and I was going to get some, but needed the saw, so I made some out of some oily tropical wood. Can't remember what, but I made several sets, which I have not used up yet.
On smaller blades, up to 1/4" or so, I just bury the blade in the guide, and don't worry about it. Every once in a while I remove them and square them up again with a sander, rotate them 1/4 turn to avoid the set screw marks and put them back in. The set screws make dents I the wood, so they are difficult to adjust after shortening them a bit.
Rick P