I purchased Oshlun blades for my TS55 and was pleased with them, especially the lower price.
Unfortunately I didn't do any fine wood working with them, I used them specifically for renovation work, cutting up subflooring and joists. That said, it made a nice cut. I won't say as nice as the festool, but hitting a nail with one made me cringe a lot less.
I'll double check if I can find the blade, but I'm pretty certain the carbide is nowhere near as heavy duty as the festool. I remember thinking when I got the Oshlun that it was cheaper for a reason, but all that is perfect for my specific use case.