So here are my $ 0.02 on the Type R hop ups, that the Type S doesn't have.

1. Aluminum uprights (3 degree toe-in) Nice looking but not needed. Type S has much better upright that offers better camber / roll settings

2. Aluminium motor mount - must have! However Yeah Racing gives you more flexibility for gearing. It's only time I prefer a non Tamiya Hop Up
3. 53159 4mm Aluminum Flange Lock Nut (Blue) Nice looking

4. 54247 3x18mm Aluminum Turnbuckle Shaft (Blue) x2 - nice looking.. but too soft and bend easily. Eventually you will come to the point where you may want to opt for the Titanium which are expensive!

Steel ones from TT02S are stronger albeit ugly

5. 54501 TT-02 Aluminum Propeller Shaft - must have upgrade

6. 53642 5mm Aluminum Ball Connector (Blue) nice looking, better to buy the TRF fluorine coated

7. 54500 TT-02 High-Speed Gear Set (68T) Must have

8. 54502 TT-02 Aluminum Propeller Joint Must have