Surprisingly, they're pretty decent. I had never heard of them either but, for the price, I took a chance. The first set of tuners I ordered from them were just too difficult to turn. Returned them for an "upgraded" set and they're much better. I was very surprised at how easy it was to setup the bridge too. Lots of resources here and on YouTube to help with that. The bridge dropped right in too.
No drilling required top install either.
What made you replace all of that? Were the old ones bad or you just wanted something new?