Body Expand has four choosable levels. Each level adds 25% BP, -25% speed, +50% strength, and +20% endurance, -30% defense, and -15% offense. No matter what level you choose you will have half Regeneration and Recovery. Body Expand doesnt actually drain you, so you can stay in the form forever if you want, but it will amplify the drain of forms that already drain, such as Super Saiyan, because your Recovery is lower so its drain will affect you more.