Easy to install, and amazing customer support from the folks at Southwind.
Noticeable speed upgrade when you get all the parts together. Just make sure the rods don't fall out when you first take the sprocket out of the packaging.
Replaced the sprockets on my V2 drives with these. The installation is pretty straightforward but be sure to follow the directions or you will have a bunch of graphite rods fall on the ground like I did! Luckily I was able to put all of them back into the sprocket.