That cultivator sounds like a good choice for medium-sized tractors with around 90 hp. The 2.5m working width and 15 kph working speed indicate that it can cover a good amount of ground efficiently. The price of $12,000 seems reasonable for a cultivator with these specifications. It should be suitable for general cultivation tasks like seedbed preparation and weed control. Do you have any specific questions about this cultivator, or are you considering purchasing one for your farming operations?