Riders and horses are supplied on separate sprues (which all still stack nicely - sorry if you were expecting to get away with me mentioning that this time) with six riders or six horses on a sprue. So four sprues for the models and a further sprue for the bases.
There's a bit more available to the Mounted Samurai in terms of weaponry than in the infantry set as they can be equipped with Katanas, Yari or bows (bows did not feature in the infantry set). The parts seem to be easily interchangeable, so I don't see why you couldn't add bows from this set to models from the infantry set if you wanted.
The horse sprues are unremarkable - they contain the bits to make some horses. Not much to say, other than to point out the large, spherical items on the right of the sprue as pictured below. Apparently, these represent large leather bags that the Samurai would mount behind them and inflate with air. These provided an ingenious, lightweight armour from missiles being shot from behind them. After being pierced once or twice they might deflate, but otherwise formed an arrow-proof shield that weighed very little. If playing the "Nippon" rules, I guess these could be used to represent "Horo Cloaks".
Once again, the models are of a very high quality though are a little smaller then you'd expect in a Warhammer game. They're certainly great value at £16.00 for 12 models.
All in all I'd have to give this series of models a big "thumbs up" - my only issue is that you can really only field your rank and file from these sets. There's nothing you can use for your HQ, Specials or Rare troops.
In the near future, I'll hopefully be picking up some models from other sources which I'll use to grow my fledgling Nippon force and will report in on them.