Why not. Revell kit isn't a real 05 version. The back hasn't got the messing (front needs to be opened and inserted with own mess), wrong diffuser, wrong rims (which is corrected in the SMS kit which is nearly as expensive as the coming S27 kit)...
SMS is needed to correct the Revell faults.
I feel cheated by revell with detail level outside car. S27: I feel cheated by the price...
Well my sollution for myself, I buy: 05/06 cars (and 07 decals non LM) SMS/Revell; 07 LM 4 versions S27 (for me the S27/SMS kits are just as expensive here)