They make adjustments more accurate. If you are serious about racing ill say it's necessary. Check the integy brand they have a good price if you want to spend a lil more go with the Hudy setup station.
Xray T2 009 EU Tekin RS PRO Novak 13.5 SMC 5200
Team Magic G4JS O.S.12 skyline 12plus
What came first the chicken or the egg?