In my opinion, I say "yes" If you went to buy the parts separate it would cost you more money, and if your going to race, you'll end up upgrading anyway! People will tell you to get the MBX5 standard, and get the king headz kit which is around $220. The Prospec has more items then the King Headz Kit. Even though ther are some parts that the king headz kit has that the prospec doesn't.

The King Headz kit consist of:
Complete set consists of :
(1) KP-500 – Steering Ackerman
(1) KP-510 - Extended Motor Mounts (pair)
(1) KP-530 – Rear Torque Arm Mount
(1) KP-540 – Front Shock Tower
(1) KP-550 – Rear Shock Tower
(1) KP-560 – Front Torque Arm
(1) KP-570 – Rear Torque Arm
(1) KP-580 – Front Lower Suspension Plate
(1) KP-590 – Rear Arm Mount Set (1°- 2°- 3°)

The Prospec:
PROSPEC STANDARD PARTS

E0117 Titanium Rear Upper Arm
E0118 Rear Lower Arm Support (5mm)
E0119 Front Lower Arm Support (4mm)
E0120 Al. Front Tension Rod
E0121 Al. Rear Tension Rod
E0123 Lower Arm Shaft
E0124 Rear Lower Arm Shaft
E0126 Al. Rear Upright R/L
E0311 Servo Saver Plate (5mm)
E0503 Front Damper Stay (5mm)
E0504 Rear Damper Stay (5mm)
E0703 One-Piece Engine Mount
E0807 Titanium Steering Rod
E0808 Titanium Turnbuckle Rod
E0812 Fuel Tank
E1002 Light-Weight Body
B0104 Fuel Filter S
B0413 Color Silicone Pipe (Gray)
B0518 Height Gauge
P0315 Carrying Bag M (Gray)