They are in fact a blade, does anybody sharpen theirs after a lot of use?

Nope

Do you think their performance changes after heavy use? It’s obvious that it’s winter and I’m bored. 

I’ve never had to sharpen mine after 6 years 

You tapped or glue on boss? Man I’m bored. You run a dual blade setup? Let me tell you. I ran a dual blade for the first time this past summer up in the weedy north country and it was life changing, for fishing that is. It was equally as big of a jump to 2 blades as it was from none to 1. Now I need to see if I can fit three!!  man I’m bored. 

I don't own one, but I don't see why it wouldn't be a good idea to sharpen it.  I mean, is it possible to cut weeds too well?  Does anyone ever say they're not getting tangled up enough?  

 

Plus, I too like to sharpen things when I'm bored.  I find it meditative and therapeutic.  My hairless forearms will attest to that.  

 

 

As a person who has hit their finger with a spinning TM prop a time or 3……..

I use a Grass Goat.  Never have sharpened it.  

I stay away from weeds, open water trolling on Lake Erie....

Not a terrible idea. I've noticed mine won't cut pondweed very well on the prop I have now. My old TM prop was much closer to the blade... seems that the pondweed just slides off and gets in the gap.

Probably small files:

 

I'd bet against me ever doing this, since we don't really have an off-season in Texas. 

 

I've had to file mine down because of nicks a number of times. Put an edge on it afterward and replaced it when it got nicked up again.  I tried a two blade metal prop a number of years ago, but there was a big performance loss over the Ninja

23 hours ago, papajoe222 said:

I've had to file mine down because of nicks a number of times. Put an edge on it afterward and replaced it when it got nicked up again.  I tried a two blade metal prop a number of years ago, but there was a big performance loss over the Ninga

Dual ninja blade is the ticket 

Sharpened mine 1 times since I had it years ago. Probably didn't need it but I think it did improve performance slightly. Might add another one.