[Stonehauler]

Always try to test drive the car with the engine/suspension you want. If you want M-Sport, drive an M-Sport (or at least a Sport model) If you want the 528, Drive the 528.

If I were in your position, I would cancel the 528 until you can drive one. If you like it, you can try and find it again. The engines are different and will drive different. What you liked about the 535 might not be present in the 528, or you may find that the 528 is perfectly fine for what you want out of the vehicle. What matters is that you like it, so don't be put off people here. That said, you should test it so that you will KNOW that you like it, instead of finding out later that you hate it and regret not getting the 535.