What you have is 2 beautifully updated G1 characters, overall, this is a great set costing only $35, you get a more accurate shoulder cannons and weapons for both figures, a accurate head for Red alert and accesories for Sideswipe.
The only downside is if you don't have the figures to begin with. Sideswipe can run quite abit nowadays and since the release of the Masterpiece version, prices for Henkei Sideswipe actually went up. Red Alert is relatively easier to find.
With this upgrade set, Sideswipe and Red Alert finally is complete.