They're a great value! Sealed bearings that don't need much, if any, attention.
Loads of fixed-commuters use them here. Young trackies that don't get their dad's old Campy hubs tend to use them. Used to be a common choice for the couriers until Goldtec and formula hubs came around.
I've not heard anything bad about them. And they tend to be around £50/set here.
And you don't have to use the Miche carrier/cog system, any standard cog will screw on.

Only snag is they use a 14mm nut instead of the standard 15mm.