No, we offer 3 different types of Kits for front Work Ports. The kit in your post is only one of the 3 types of kits we offer.
1. Electric Selector Kit / Select between Buck Curl and 3rd Function
2. True 3rd Function - On/Off
3. True 3rd function - Feathering Proportional Control
The difference in our True 3rd Function is the proprietary Manifold Block that allows continuous Power Beyond Flow to the balance of the tractor Hydraulic Circuit, even when using the 3rd function, and user selected flow to the 3rd function Work Ports. This is done by a custom Pressure Compensated Flow Valve cartridge in the manifold. The user can select how much of the Joystick Valve Power Beyond flow he/she wants to send to the 3rd Function Work Ports, up to 50% of the Power Beyond Flow. The key is that this flow is pressure compensated. There will always be Power Beyond Flow to the balance of the tractor to assure the tractor hydraulic system cannot be dead headed, even if the 3rd function flow is dead-headed. This protects the tractor hydraulic system in case of user error or component failure. The pressure compensating flow valve should not be confused with a relief valve. Pressure Relief Valves, like the one in the tractor hydraulic system, offer protection for short duration dead heads, but will overheat the hydraulic fluid if the system runs against a pressure relief for any given period of time. Pressure Reliefs should only be counted on for "momentary" pressure spikes.
Our True 3rd Function Kits allow you to use all 3 functions at the same time (Boom/Bucket/3rd Function), and operate the 3 point hitch while using the 3 front functions, if you have enough hands.
This same Custom Manifold Block and circuit design is used in both our On-Off and Proportional Control True 3rd Function systems.
All 3 systems are described further on the miemachinery site.
Hope this helps
Team MIE